Malicious PDF — malware analysis report

Static analysis result for SHA-256 796977f98c33105b…

MALICIOUS

PDF

81.3 KB Created: 2021-08-28 12:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19041d3de4a411f7d042ae1270b9e1aa SHA-1: 5ba6bf6f66537afb7c64923ade2b6c3198f3a906 SHA-256: 796977f98c33105be8e2e9179d05859ca07969c10b9c181cba22e2f70d5ad6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs points to a broad attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6092e3aee---piwinosatefino.pdf In PDF document text
    • https://people11people.com/uploads/File/48931309233.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/38829919472.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/98453556070.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gomomapaximi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/vifiburi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d774ad89---venoreladimanonu.pdfIn PDF document text
    • http://flexa.cz/docs/file/2530861593.pdfIn PDF document text
    • http://secoinblock.com/upload/files/juxepiwevoxewiw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d50d7cf9e71bce17f41a3319d4bd7c74/32355286754.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/set37grugcti1lfhrotn9j34n7/32255619523.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8d644954e5e4d64783d6991405b1ffa3/xipogosuxapapavivakekenaj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/7692432757.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/mifumisejubadawebetepi.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/tagumavesiwule.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/50934915213.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73dd04853---zugeloxoduz.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tuxeximafiravafenixuzi.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/aff01e94e5a50f4f2845a5993cf853d3/votajoluxalatigujepit.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/8930727320.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/5985561452.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/diiagu0kfafka8nnetat012u9r/fekugukikotufagefagufu.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/85275524353.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/rkqog9dse8gfnnkncm52cpc906/7212863911.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd08d648ac---98537794371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fps+roblox+downloadPDF 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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10368 bytes
SHA-256: a1a4cb4409a93c0189038fe14f85c6ab7a457d842aa9f88dc8798817f948164a
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16728 bytes
SHA-256: ee3071928d6105365ba7eccf5017a130cddc0890f2fee92dec09ced2a875a80b