Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d85c2fc262de0fd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 21:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0799d62317209b359aa1864a7d224a54 SHA-1: 4509cdacc2fcb0a35ed42db42aa6e8b67c937360 SHA-256: 1d85c2fc262de0fd30f560a6e73df36a1fb21121f8cb436ab4f36b40a5a554bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vtaky.sk/media/file/51850914157.pdf In PDF document text
    • http://atek-ent.com/upload/file/raxujawuxuvudevamewalem.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/dfb5e9488f781a3cf7103b640991c269/37276353117.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b305f948643---jidigemomejuxazufi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4ee3d6a1---92869243779.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/jikajulabuzutoful.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847fa1ac338---92863039996.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/203b38edd12cd0fb13ba7cb3dc39f11b/50377628366.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/93048703462.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/d242rv384is502pddv10p95tq5/28437066218.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/4115018116.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/bljf8cj4pndbhrssoijl17ob30/90935397746.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/61sj7ina1paeo7ek2hgjud9s93/nutole.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/88394199964.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a575f5a9593---14013106244.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/25044732436.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/dagoxunurogilim.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20368210106.pdfIn PDF document text
    • http://ledson.ru/upload_picture/15138935458.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/logisi.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/45210844377.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/42941608421.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcabb4ab6c---dewevazilezijogikes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=running+dictation+texts+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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 17748 bytes
SHA-256: e2bc7e4c3002c7b005e115703a06c56d76db0d68f51ae0e2e4ed448debb7f5bf
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 10896 bytes
SHA-256: 84e733d71a5d8dd2b78f07770993c2b65e1d074979dc16b58245d404f1b8b0c8
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.