Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f333c27c2f0593…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 06:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38e858610764656b2313d4841e954c0f SHA-1: f68f2a3cb7fbc63b0527b6545fae4be506991e11 SHA-256: 70f333c27c2f0593c06114bd832efa8354788a3ad304b1945c3b25c41d3d6519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to manipulate search engine results or distribute malicious content, aligning with a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://accesoriosalmayor.com/images/userfiles/file/xidogajuwiju.pdf
    • https://songhong.info/userfiles/file/rolirinumulejuxibonuxi.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2435573acd---85327521027.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/74309288551.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837d73ee487---84971382734.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5errkvihf3ovg9r1h0dqn297ou/58829858065.pdf
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rr3ld61d113jqvd5j4peeahr2v/65018243680.pdf
    • https://rwd1.thadv.com/upload/files/19286179690.pdf
    • http://axwelindia.com/uploads/varow.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7029133eb8---30793662337.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a589198eaf6---61417434842.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/posuvibigiwipake.pdf
    • http://almar-bus.pl/userfiles/file/tajaropupugala.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021080721243373499.pdf
    • http://visit-pune.com/userfiles/file/54160174636.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64359c196e---vunufisoruvagasodofogex.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4c9380ff95f6e3e01b80038446715f84/15928122452.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/97133447560.pdf
    • http://35ct1.com/images/ckImageFiles/files/87083186500.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/664b568a24244eb7d12c71af62625a12/pagep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bissell+promax+plus+owner%27s+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9de.bin
d03e66f1db5dc5e0d2dad1697f37d2bd4b599cfca587eed364136a69a73648fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 16428 bytes
font_01_sfnt_off0000e426.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 16792 bytes
font_02_sfnt_off0000fc3d.bin
b80fe8f360a1f9c920afb1fe633897135ee5e91874d478fc7a06a82dfbe7ac23
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 10688 bytes