Malicious PDF — malware analysis report

Static analysis result for SHA-256 f630c5f91e2b9650…

MALICIOUS

PDF

99.8 KB Created: 2021-07-20 12:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e0c258cbe699a4f71813c961afc4c4c SHA-1: b88b27819d2e0831e2b34a34ec83b00698cc0fbb SHA-256: f630c5f91e2b9650bd76ebdd82d6494e7363c706f5026166fc9805b2fa236bc3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874c1026bdf---14100378807.pdf In PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/rimilogamuliruzop.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a989cf296b0---wuzaxebumabaxever.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34f3ad181---75540577745.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7afdc1e9f9---seduwedaxajokojakuf.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/97805582809.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9658624b6---linevezaluzugowotenalubid.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/14521903551.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef32bbaa75---fulog.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d04f042a---19579535854.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/umobth1h1cb097r9g1hvvjlacu/56882336632.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/0be2387b43a647f236f0f348709359c9/walefazivijosamuniwekumum.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/91cc200ee687d83a57bef4ddec1035eb/lakaburirarebosobedefipep.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/wegikezeninuzeguluka.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4d1a20dd878edc36437c4a3181510ad5/36321604768.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/54b47ca143f49a8631f2baf070a748f6/11017047591.pdfIn PDF document text
    • http://safetypath.net/cms_images/97165307013.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sv0uhqqlskte4s00c9t3467e0a/mewiwax.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c16680b30---jokujumuzoxulokag.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/85075275097.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/budul.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b558105919dd4e55bd5226f990379bee/tuvukipiz.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/budafakigakuni.pdfIn PDF document text
    • https://sinarwaja.com/account/files/90238099974.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/ropunurovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=one+page+cv+template+free+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_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 17976 bytes
SHA-256: acdb2b3caf839a956b065fcb2eff8ebb1b89b9c2c7f9b9baf0888dccfd88422e
font_02_sfnt_off00016731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16731 10880 bytes
SHA-256: e0bc7fa1830e3481119aa5287a28e5269c452b82c54c19119be96d8b5c6783fd