Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d57e2e91a6fd40…

MALICIOUS

PDF

93.6 KB Created: 2021-08-07 22:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f0b9851de2107d24f44d1a9d2186f0b SHA-1: 8df98988d022fbbe5bb16a6c892eab59253b6d77 SHA-256: a6d57e2e91a6fd406d248633672d23adf4e8bf1e9eced6fcee2905b85cc24b70
224 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of 'payment redirection' and 'callback' lures suggests a phishing or business email compromise attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52bb7fddfc69775b1791319ae87af7b4/58646955603.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9144d4b0720448ecc486c63642481c5e/36256671353.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nemakijaxu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/96354131042.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff65b7da3---bibeno.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23582580447.pdfIn PDF document text
    • https://okazionche.com/files/zewapifadiza.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/nazefusabebaguxosi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae24e0b0d---91636472546.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3b31cc428ac343a777c16ab90f203d12/lidakodisesebeme.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/83634269614.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/vofafurotesepebarixod.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4f36de4d5---jagajoravasigol.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/18180130089.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/44513999476.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/92827124671.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0043f4a73e1b81b0abc3731bbc8f91af/javenuwugeluzo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e191e462afa---4758552488.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3dcd1468c---72947081640.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/48267170468.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/75718128860.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b0fbf53e4f475167ec8444631519bcd8/44943227680.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160860af433a6a---wozaxeso.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/21380196483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+account+verification+letter+from+chasePDF link annotation
    • 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_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 11028 bytes
SHA-256: 6e79ba12adddef100edd87748370c7a2bd001ab67420d2fcd7dec3206cc3bbbc
font_02_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 17628 bytes
SHA-256: 2462b1b26ba2570481b54a1c9cec0b5cb9269b863fd8d08ad9c7203d1840d6b0

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