Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f921d4c5dce2b7…

MALICIOUS

PDF

95.6 KB Created: 2021-08-09 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb85c0b16d5a48b3c1f016491f1b7740 SHA-1: 69e86fe88f6894e7276eb0dad7972780f5a4fffe SHA-256: f5f921d4c5dce2b742605bc12213c8b1df903baab3a42387aac200eb09f71317
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and raw IP addresses. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=descriptive+words+for+sounds PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ebcbfc5bcbb80238b0a87a6b036908fc/gumajeba.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078f140c509f---busenejarugixorenanago.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1b7ff6f228c5a8d9e9a6de11acbacea1/19400999884.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qmjuh3bspd5ok0q43l6dc84dbi/12923796951.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/paxepasowiget.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/gafaguvulaga.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb6644c3e---14085243808.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nezaxovesegit.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bb9fc76d3d4449c0b983d73e3cd363a5/55643208520.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kalitapimav.pdfIn PDF document text
    • http://hotstamping.pl/files/file/ridupajibuvixetupozix.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d31d54cebb2f808d933b514d37dc18e/reguwamuponamuvekimowin.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/99f16eb6c9bd6d2227a395440a1cc7eb/26302766269.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a1c616a397399e4838bb0aa213cb6653/kujutozagazidonilifex.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/deferopelibo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/1710121713.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/uapk4e7u4pvvem7dpnjlf334s7/45107234429.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddd45ee8e2---teresiwofisuxakefase.pdfIn PDF document text
    • http://lukinserv.hu/file/direfuduwetumos.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b02ac636---napamitalamid.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8d049260---paradugewujanisi.pdfPDF link annotation
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3adf02a6448b7bfe8aa1a6832dfddfe2/93041009938.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/goxapox.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/02f97f55241179eff6d310b0d6293e96/zawovorijibidaponubeduko.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_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 10656 bytes
SHA-256: f5262b23ff8744966bb3884d470dcc00174007ac69806c2630d26a2baac80166
font_01_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 17620 bytes
SHA-256: 2644863b5d060b8615b88ff05c7685f7a6d29336f24a8307d45ace7f6a0f8e2b
font_02_sfnt_off00015796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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