Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60fc76bc28e05e2…

MALICIOUS

PDF

78.4 KB Created: 2021-06-18 18:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dfb884b2f6ee52c57d273777250cb804 SHA-1: e4daf4217c20f56850517724e765fd25a43a37dc SHA-256: b60fc76bc28e05e275eb5465525642093084de78f9a314d916309ac67f89e52d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution tool. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the true destination or leverage vulnerable infrastructure. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3d304527---24566988480.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/613932935a64ba21b96806315e7dcc5b/pizipavorixogirekadabi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b7b87906---lobapenexas.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lusolobusufibotoka.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/73b2602018595b5bd21986a5c13de1a6/vanafusigowuwawamamopuro.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gijukafigenuwi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/93475631856.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/92099c9db0bffbfb404f06f1114bd30f/68290274175.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9625750b533a00d6336863e3dfc50760/87904986620.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8876a86b---60587527317.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4009176392b62caf93285e1f9e8e9535/23301248261.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e3631386---xubawexeku.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbebb8577---12039362082.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1499c03449cb0621f65d7bee1eaa586e/biwize.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0fde95d4b---wijan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cardi+b+yellow+mp3+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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000103ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103AD 22780 bytes
SHA-256: 1fbf7c302acc722f134c7a46469c93e4be52c1e59d0ff512dfa3ca4b37d88f2c
font_00_sfnt_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 4052 bytes
SHA-256: 0562d37ca027ff65286821dc69fa8ba38446ba6f27c5fb9cd390a5e33191cd00
font_01_sfnt_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 5328 bytes
SHA-256: 726e05cbfa6cf1f278ad0ee119a221a099971fb484522d8c845f9ced6af1fc42
font_02_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 10620 bytes
SHA-256: 43f9eb8915f32b960ee12bd0b33ac57fff7f0cbf73510725d78fdc6395ee67b2

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