Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac75ef12d2a38a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 12:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c570240df874a64fcd9ef2f826c5bea SHA-1: e611c9bbaf0f25294f27aa0b2da52308adb7c304 SHA-256: b8ac75ef12d2a38a8cb8ff9d7a76b92763dfa303208de07ef24d75432f3bdc6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a provided phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of numerous links to potentially compromised websites suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://hasadtemizlik.com/upload/file/dadakirumu.pdf In PDF document text
    • http://alkanboya.com/files/file///kisawefuturomal.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/duzopavozi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149f1ebed9c0---38925917103.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614685aae1427---tepipirasomuvasimo.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/95862846097.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/sumotozeronewewisof.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/11473718501.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/sanunu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fewil.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eca3b78ab---dikogisibubu.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/lapumowitarumadugomemupu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdd416281---54063401061.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/84340075413.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/56452402718.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/zoxufoxanukixun.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/46576976670.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/nepuripedesoxelovo.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/76748532306.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/9572843658.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/wanebesupenifiduxinoguz.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/64840628159.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/guwubuzotemovoguxilajuju.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/70226760612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=redmi+9a+camera+settingsPDF 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_off0000aef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 10760 bytes
SHA-256: 72d8df7b6c7e753f7c3be5e6cfa8f41d31b16d282d2f16c09770131bfc1074a5
font_01_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16088 bytes
SHA-256: 380f488ffccef0f055079dae57590b0e7c4f0c3cd5824919bb5e488c89aa0911

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