Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcabce1f0311a69…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 13:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4643ceff61176742f74d9d44fe1f01d SHA-1: a9a3ec94198f6ef64aa95c8f874977ba5bbd92a1 SHA-256: 9bcabce1f0311a69a71e301d0a98b017cbdd21a5e8c316be1b74da4bad184398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=can+you+remove+snapchat+filters+from+a+photo PDF link annotation
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/52936944535.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/74609109355.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210902011453.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/24051595699.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/89287236680.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/71155207669.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/35753003896.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98597237458.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/zerumamiguxutoduwalutuf.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/povuj.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1a0e66b990462d7480d485504f6f0336/sokamabijovuwusesodij.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/17995237051.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/63457746551.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/gegejawubovetite.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/61037707421.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/32413237931.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/4102573446.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/gakufiwufoloruvosogoselop.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/fojatogunilodixekogamur.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/45662eb86a3820aaa1b7013f43918af0/7764172549.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/vagabajedosugadirodusaf.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06cd62a3a---viduzobaxakalezodoba.pdfIn PDF document text
    • 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_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 11056 bytes
SHA-256: 422b3e77bc569f8682cec2c53abed34ddc9b721f592d5e758823bf92b4bad635
font_02_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 19284 bytes
SHA-256: 7a9627f44c807e0c2f563e8134d24f4ec0aa6e96305a29fda6eb472ef2bc7f26

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