Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49eeae268a44089…

MALICIOUS

PDF

90.0 KB Created: 2021-07-08 11:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e50531ac4573c5cea7ee39266e67ddd SHA-1: b03557e9cbde17edc4eb1953653121a77caf4023 SHA-256: b49eeae268a44089b11c6f75ce36e28ccf472c44fd829e8ad2a6c4a2daab5a68
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious by ML and ClamAV, exhibiting characteristics of a credential phishing attack. It impersonates Outlook and directs users to the URL 'https://pistant.ru/uplcv?utm_term=content+being+single' to harvest credentials. The document also functions as a link farm, pointing to numerous other PDF files hosted on compromised WordPress sites, likely to distribute further malicious content or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://pistant.ru/uplcv?utm_term=content+being+single.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=content+being+single PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/be386djrfibsukpce2hucqdmrr/15661628983.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ba13da072d1630eb0d3004d4497acc9c/nekuxodidu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/filulut.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jozokupuwewura.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/9208210233.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210602215121.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/udfgen2086rr1vm1atn7puu4d8/wujoj.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/fesuviledufoxas.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbff8c976---17083061413.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608182dc7a569---febaxagapuzoluwuv.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088beb127e30---70333805836.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d95c69912---70476330264.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a53eeaba---42249189934.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/2gc9o8r8poai2eh2tfvhvf081v/sekopivixalezetadikunu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/91b175fb6e997b8d5630f605ffcd422f/52229859886.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210522175545831.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/346ef00c6431f2ef87f7d9d3e4aac543/rafudofapo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/77317767407.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca2a999e4---22957145168.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4880b791---nuturiwi.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/vatelanuvevimujoxavinozuk.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/nivuxeb.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/93849433180.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/340b0bf5df670ffb158a5c588b483196/87534491913.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/ninetowizagugetad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 17272 bytes
SHA-256: b0eef65bc30449ae1d1997766bc071ae64c7405a5eeeebd5f13d71d76a7a5f44
font_01_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C5 10192 bytes
SHA-256: 7632131dfbbfbe39f9549e0d3680e4de5bb6e2faaaf0dfc037218d8761f4fe12

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