Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4056b07d16552c6…

MALICIOUS

PDF

118.9 KB Created: 2021-09-04 05:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a71b2e6fdb8ba6e2c1de78c0714837ef SHA-1: b4804b37bad59c05122a47d7e0a58a9ac44bfee2 SHA-256: a4056b07d16552c68088394f13ef9750d09065a8ab46a0bf7a9929fc23358b31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URIs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=technique+de+stockage+des+hydrocarbures+pdf PDF link annotation
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/60581415341.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/35103793055.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/41033849196.pdfPDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160db994dcfed1---66409992181.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b22ae939f---fitunesivukapuvugixag.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/adbq93isasjtgn32gqm1f13b2t/kojug.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8b93f336---54666703501.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/70104998912.pdfIn PDF document text
    • http://sakem.org/userfiles/files/tijawivupetotob.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a002119a7f---82595597872.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/23310654073.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/22256087208.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/napezit.pdfIn PDF document text
    • https://lasanisports.com/files/tabinabarulowa.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/83657191131.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85946eb0b39ccd3ebe844ea3a30767f0/dowagudulobesudujeget.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607908d083ee8---fanujupe.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/besanowojanavipepiwejuv.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tobevuxapawatitokewano.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9b215441---pafimepisuvesimenezubop.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/umifsqjninor6sf9gtgc4k5nrh/xumurigumeja.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_off00016046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17858 22620 bytes
SHA-256: 79a66556d2e0c0ed21ef16a20537a85f60ce4ceae9170df053436493ca916154
font_02_sfnt_off0001b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B22F 11408 bytes
SHA-256: 4cb20eebcc0f0b328a834c497b0cdb0adb601ea1ebf80b7e249293e0efe5acc0

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