Malicious PDF — malware analysis report

Static analysis result for SHA-256 a617dbc2153151bf…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 00:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af26a61cf4c961efeed6d902d995af20 SHA-1: f32611534927a9ab861da61c062d0a7b39992fce SHA-256: a617dbc2153151bfbb434b9ff26b773d912842faae4c9449c8ae8b689ae2c575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

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.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142565fea747---kotudemipukiw.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/kiworiweze.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/9515261731.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/30125966542.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109270303091963.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/6048177538.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/korujofigokomagalan.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210917120724.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/5705414494.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/gumiki.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/vijoderuvu.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/88917888828.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/tukifanozopokajo.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/60827288557.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/12425103991.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161317e9ae48a9---33817969376.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/banijudigediramigukewamod.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/23c0df700d19621bbcb1cac3ef2621c3/jolegolapolimawanenop.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/manavitut.pdfIn PDF document text
    • http://anpo.vn/upload/files/97070706582.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/17187060031.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137923934cc2---jebotupuwore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kodi+19+tv+addonsPDF 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_off0000ae28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE28 16728 bytes
SHA-256: f0b069d34d1a596c90d9a3933aceb64a798c4f314dd22cada0aeaba76bc0aec4
font_01_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 10240 bytes
SHA-256: d5c8f31f93b4201e5b8eebacad865f49b2da086347d559a249026fba6725f948
font_02_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1