Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4e4aa3f3c373b5…

MALICIOUS

PDF

78.2 KB Created: 2021-06-12 11:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8e7b66cabe02517ac6c969168081042f SHA-1: 4b9519c10c582d092f41782052b9f140a792a02b SHA-256: 7c4e4aa3f3c373b561823b9c0b0af87d35aa29fa343eace346e774153cfc8e5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a link farm pointing to compromised WordPress uploads and potentially malicious content. The document body, though heavily obfuscated, contains text related to downloading software cracks. The presence of a security bypass instruction further supports malicious intent. ClamAV detection confirms this is a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://allytemp.ru/uplcv?utm_term=download+visio+full+crack PDF link annotation
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb6e78f47d---sufiboxo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76982299468.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160777ebb34581---gaponasotab.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/84206434232.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/64280473820.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609406f800f99---tibixolivoziwujafu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6f482f2a1ba3c11b3b7320ec6d2a1944/78333370813.pdfIn PDF document text
    • https://noddy.nu/images/file/94123083384.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/83065542162.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9ebe0399---65751920803.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/goligetono.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9bb38b5b8bbe81080e7522d7d10fda84/sikigenifubivup.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098584ea09eb---21447441716.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1a143c84---2624760911.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/86267625819.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/malulimekogalilute.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/20001883007.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fad8e05b9---58973811088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5232 bytes
SHA-256: 9b5f3695e18d0cb7cfda4948844b2fd9235701aa13bdc097bafd1073acc30924
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 11184 bytes
SHA-256: f33d3ad5a28cc4bd2cb69d3360c283af39f5e02e73be6a4b480286c38ecf146c