Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7893ef6034765f7…

MALICIOUS

PDF

69.9 KB Created: 2021-07-01 17:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0531d600c543898b46c81309fade7d3 SHA-1: 835a6bd8389d3063daced282bc753cad6da4ab3c SHA-256: a7893ef6034765f7ca79acf3c1aeda68a3f2b287d633c4a09ea9c2fb32b43584
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate that this is likely a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/maigdgsoe7q41aa8cfitla33pd/dekasurixe.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8d53ace221b881a1cb0a1ea4dc4cbdb3/zodudedobadozu.pdf
    • https://okna-stv.ru/userfiles/files/29609040532.pdf
    • http://tpdw.pl/userfiles/file/kakagatavisib.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/dobabavuxamikowoje.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7be373844872325824bb1865c5382dfe/54759516049.pdf
    • http://biirbeh.mn/images/content/file/bemavar.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b79b8e48a062e24bbf074b49303bfbcc/95470812863.pdf
    • http://all-pass.com/folder/editor/file/raguje.pdf
    • http://www.irrv.org/uploads/files/42007272615.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gq3qhhm6nljbk5h6gslkkrfm9f/berinomevu.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fcc0295624cd11972732c00b3e5a6800/84395117046.pdf
    • http://alimentosldm.com/userfiles/file/dutitunolosomav.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2kftfjf5u394o4d7d53a6hmc25/mizexunel.pdf
    • http://musorcentrum.hu/files/article/file/mobevatudikakabufe.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ee900e015bdea5210994c42b1b9ccc68/82905227072.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/14093715196.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2a19632dd4c152b54785062f0c138ce6/99562196959.pdf
    • http://climacom.eu/userfiles/files/76906065916.pdf
    • https://nutricount.cz/UserFiles/File/16232613352.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160870f1326b3b---2404120336.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/funutogopupadunipupum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=if+a+graph+has+no+odd+cycles+then+it+is+bipartite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b235.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 16792 bytes
font_01_sfnt_off0000ca47.bin
8ee90cdf14d5526e383ab7a443ec25941ca7033f7724bf8ca4cfbe78d5c3bdfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 14948 bytes
font_02_sfnt_off0000f0c3.bin
dad3e2382a9afe4bb12540c5377286f76c2da3a5ffe4b3d48307d151bedb8928
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 11104 bytes