Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1616bf76ea868d…

MALICIOUS

PDF

81.5 KB Created: 2021-08-17 19:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 471d64c9684cd71a14e4e9705af9b768 SHA-1: 61844cea53dc12c566bd50da26cec510116e2d19 SHA-256: 8c1616bf76ea868dcb5723b3558a07c1a63470697e6a7e9bfa82a17ad7dfde07
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing lure, prompting users to call a phone number under the guise of resolving an issue. The presence of numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggests a link farm designed to host or redirect to malicious content. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://ketchas.ru/uplcv?utm_term=non+chronological+report+worksheet+ks2 PDF link annotation
    • http://bkdesign.ee/userfiles/file/20245912036.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/59978944694.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4e4f4b7852d621708accd15fb49af7/memamevakobasokajiper.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/87269151633.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/89914511513.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289c8f20ed---gimejela.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/81518752518be122a78056565acc3ab3/gitegoladilamajodoga.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///vipelibetetazusafaf.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/59828931825.pdfIn PDF document text
    • http://com123.vn/uploads/file/56298047622.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/wajaxijub.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/97075521687.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4a9f6c60c64fe7b754a00aa38a7ee32e/dudamudezopiv.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d16d57e9aef7517e40bb0eb442d334b8/xemuk.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/952a362a15af058b54a791616d0edf6d/14887910922.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/rebabibupafomikilugu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f355af16afd---90482883141.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/2c746c711fccb6610603548badc4c46a/nusupitagupivibapub.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/xasowewobetigelofidusejax.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bd871c---pijimixegitelazinawajuni.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d455248d056---pefab.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/57747385770.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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10928 bytes
SHA-256: 19fc130046a70cd09656fc7fe5c30eaae39b75dde8856bb1265ae77c3b32f574
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16948 bytes
SHA-256: 362533dfa6099ad160cafbbeb438b0fbe6403d511d3d63a079bac3649cb974aa

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