Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7901bb0f43fa9b7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 13:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43e018d7a814f63c9863c9621814d422 SHA-1: 8e7ecee5d3813f657c36f1dfc5a633295023b52f SHA-256: e7901bb0f43fa9b7574648c8ff56be43ab69ae8b7295672809ce5c9d1fd19ec1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to websites hosted on compromised or disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of these links, coupled with the PDF's structure, points towards an attempt to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c123997f6f12ae6ca5c97b9ab8115f7a/kosarokimedewove.pdf In PDF document text
    • https://vestol.bg/files/file/pexogolajato.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/2899440831.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/rugitelijonerafolifig.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/55405145b993f3b3659e8e272587ad85/87735111123.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2352acab---morozuluzabi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lf0vjan29i1f3i1cd604ictmbq/20667630998.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/44034320608.pdfIn PDF document text
    • https://edusfera.pl/upload/file/2529025310.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/zefimofotifotarifed.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/xizezepoxoreb.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/vubejuw.pdfIn PDF document text
    • https://digireg.cn/upload/mepanabuxozirikipe.pdfIn PDF document text
    • http://samtekelektrik.com/files/gimigawunojexozifaza.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16106ba7d60636---67492059405.pdfIn PDF document text
    • https://soechi.net/userfiles/file/43200612160.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/35263437331.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba56dc51bcd---xolenudenomenozoniwimafin.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/75402552452.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0baa2cebd80e58259ae5451e2b2365dd/54841713021.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/76325112433.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pa7a3raqfpre1h14v5c9ostv5e/65714715018.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/85043823676.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a751bc9efd8---75720061240.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58703275056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trinity+guitar+grade+1+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://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_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 10568 bytes
SHA-256: 916edb6683548b67bfa4331cba9610275e96a2e674bf26ed38da90609f07a85b
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 18240 bytes
SHA-256: 658c608eb123a96b431f76637eb797b909d5871fbab92fc69ad83bf54cffbe22

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