Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0730768e153264…

MALICIOUS

PDF

102.5 KB Created: 2021-06-18 15:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3639815e18c58a6eb2b97a9176def339 SHA-1: ee7c47411c31f8c486daa772251da13974e055ce SHA-256: 2d0730768e153264554efe6475c916341e4df004d1b910e0e42be327aadf356a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning. The document's structure suggests it's designed to lure users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5abd040ff9fb295de0f810f19986e634/dobivizuxuzapekeroxifapon.pdf In PDF document text
    • https://latework.cz/soubory/vubogenoritodob.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabc36ea4a---wugoteveloxiwebage.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f4bcb5ce---xazomijiguxalewozovido.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddffe3a7be---xivejapamulaziburizir.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/33770124832.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c586c7778---90209872213.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbda376592---17455752143.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404baefb70---wusikiz.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16076c57e44c3c---wewerinalojiz.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f6962c37e57206c8da2ca09beba665cf/32378521298.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4863eaf10cf1ff89d07a7f28a815a158/bagunanidunofula.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0l22qql8nhrtl10pe35329pvlf/35701419471.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160875049bf671---kuvipibimalonex.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607746b36f56d---pepegunokusiwuzevigup.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/3100578088.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7dbd3d9b218244590f248e8192e7bc41/9401201066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=civil+engineering+abbreviations+dictionary+pdfPDF 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://scripts.sil.org/OFLIn 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_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 5528 bytes
SHA-256: e46f0a693e7a988236b67bbfbc9e00a4fb1d4be7c70644a5d383c7dc1744e3b8
font_01_sfnt_off00014e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1A 12560 bytes
SHA-256: c90d06d37b4385bc54e95e84d4e237dd28ca787b174a2b4b012d0bc95636175f
font_02_sfnt_off000177a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A9 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74