Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64c3e5d7a761931…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 04:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5bb755bea3b11944dec5b70fe3c51863 SHA-1: 7664715b067951c812b34c2840279cd6d41c5fcd SHA-256: d64c3e5d7a76193126e4792dd8e8b6debe5e108b0914298b2d36e47041951089
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to distribute malicious content or phish users. The presence of a 'callback phishing phone lure' heuristic further suggests a deceptive intent. While no scripts were directly extracted, the overall structure and URL patterns strongly indicate a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 http://aaronandanthony.com/userfiles/files/19329811241.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bda3bc57a---44356806819.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151ee503b346---28122189456.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/56453007592.pdfIn PDF document text
    • https://x-software.cz/data/file/11442688422.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614982fd86426---28846445131.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090604275134.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/81166928215.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/25794802687.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/kuwezolamav.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamol.pdfIn PDF document text
    • http://boldogelet.hu/media/rotejatonadaxepatipan.pdfIn PDF document text
    • https://scalping.ir/data/files/file/faxaz.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/jelugejisik.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/59370096344.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/vewaf.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/lumijesopijexemikafebi.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gapizadanegagowivageluwe.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/rijenanujipefijip.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/weraxavesibajirogasodi.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42447883604.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090403194319662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+robux+generator+for+roblox+2020+without+human+verificationPDF 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_off0000adb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 11328 bytes
SHA-256: 6a90bf2c2e1668cecd68203cb02fa27d9ca46b21e1f187d19d0235e377532a28
font_02_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 16420 bytes
SHA-256: 5aa398efbaacea63d942cac76d1488e0f57eab58ce7567875eb83f46c31fcce7

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