Malicious PDF — malware analysis report

Static analysis result for SHA-256 591c477cdcbdc2f8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 17:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3584f83fb1f44c2e772bf3f12359291 SHA-1: fd9b6974b19fcf63c5babe850df04dc2dcb25198 SHA-256: 591c477cdcbdc2f8a6bf980fe15b5336e891312e37dacb25b7b8050535c438c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=vaillant+ecotec+plus+428+installation+manual
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i2h141oj6n9ik6iatk9vn56v68/vobiraveladufobu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3k1gabvk3nfef2gdqdbb6n1ml0/96078746546.pdf
    • http://tbm-mova.by/images_from_html_editor/file/rukotamakefe.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/buzagi.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/71713822238.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90a07c128---jozofos.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f151c46640---82744321337.pdf
    • http://aaaexpressac.com/userfiles/file/pevagowipusop.pdf
    • https://hunde-katzen.at/soubory/20581494665.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/34462802731.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da030e30a4---51853666008.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/23d71cdc1947838bdc4838cb338e958e/kiwabajupazajuzuk.pdf
    • https://ferropula.hr/files/60022882877.pdf
    • http://www.rpv-drachten.nl/files/file/sonenadezenugixozej.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/klpr1s1slgf4kb6lji68h6m3u6/zobolanilosokimadojuzo.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/bilen.pdf
    • http://almar-bus.pl/userfiles/file/99150799363.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/zagoxakebulavomaregobupo.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/14302662271.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ccea0153e5292f3b382d843e209052eb/fakaleledisufarozele.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06031bde8---29072159265.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4cb7d83e7a442671a0a886d901c2d6f5/16764390170.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/27685041071.pdf
    • 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_off0000ba6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 16792 bytes
font_01_sfnt_off0000d283.bin
aadd5eb5bef2f4c5098d6b16d46a6f60dc0b42a3b7eda4599fe57ed9d53ad3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 10912 bytes
font_02_sfnt_off0000ebde.bin
cb6395e3091f28568f4bafd9a36fde6fff26c0dc54875afa0026c01f904653a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 19140 bytes