Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cf1bce0aa33748…

MALICIOUS

PDF

100.0 KB Created: 2021-09-04 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cbd771f88461f7f33b0e3ab4b5b5a4a SHA-1: 02ed73ef549f9360152f8e439258da287b86cb46 SHA-256: 34cf1bce0aa3374830001c189d216de324ba3e58fcc4cde83438eafbb10b4bb5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number in a deceptive context. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=2008+buell+1125r+owners+manual+pdf PDF link annotation
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed14c2e11---92556034978.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e89171e11534f503cb5b554e2c68517d/96604511452.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/ziwel.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9db96bbb03---porosuzowimepik.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mudejezipila.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d643c01f---95139035917.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5662760d0e---26659801813.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ec9a5adfa---83499279485.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/78976164557.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/99310940987.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t550h057lp6ubfmkij6es660mv/sorepebep.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f992c52d33---15684331859.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vvoerkg333rme7h2v9cushod9l/97342475229.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805773d2542---40925227605.pdfIn PDF document text
    • http://18554080.com/userfiles/file/taloxunuja.pdfIn PDF document text
    • http://pb-book.com/user_file/file/91519706945.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d234987e122539099741f3208b6583db/xidetobetan.pdfIn PDF document text
    • http://seto.cz/uploads/puselumu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af5ea27f48---40011481128.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/moluvaxazitaxavukeroke.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/nituxagagikusexagipejiw.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb16b68273---mimanipunutunasifojofu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6d98e36e016185e0c8d1e2498c71bbc7/15148242465.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zowaduzaruvavikiw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a0caa0d2---togerewepe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 11332 bytes
SHA-256: 4cfa89c8af99fb80d385a75d4de38b02492ab030d1104581caa6e9eb1ac704a6
font_01_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C42 19668 bytes
SHA-256: 1ddaea7a30a7de99768c61b5ada574690b78da2eeb8d10b198c2abab4acec89a

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