Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c11bf6a235ea86…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 00:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad7f5ac3519e762afb78c5848720d116 SHA-1: bcb3afd4dd065365812bdfd9cf905b44a17f758f SHA-256: 38c11bf6a235ea860b7e94afe9a7d11f745bb108e4c458d88979dbf65d57ae09
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and other disposable hosting. The presence of multiple URLs, many leading to PDF files on potentially compromised sites, suggests a phishing or malware distribution campaign. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into clicking malicious links.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://romengo.com/ckfinder/userfiles/files/74696782213.pdf In PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/86363182860.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/jerupizusemapu.pdfIn PDF document text
    • https://sinarwaja.com/account/files/xagav.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ab0c28749592deaf8b1a6a197e60aa71/rinaribodew.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/21275702636.pdfIn PDF document text
    • http://nscenter.cn/upload/files/pikavejewu.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/91307608061.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfdd1551d---bokuruzanevumofa.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/52394970092.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xizowudiduni.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/44337412651.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/50691343323.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gisinazizefuruganus.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/63699529295.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d180d29221---xowawitetunaminu.pdfIn PDF document text
    • https://j26clean.com/upload/files/gevugerusaxubexor.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cc1abf4b7368b232028a423070311d96/59126162770.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/98855091523.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/58913125366.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86f3adec6---6900581108.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/65514898370.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/43742140015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=conexion+remota+android+pcPDF 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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 16268 bytes
SHA-256: b1bb9425edc885bdca3dd69e0f52bb6a201dc926ed29d98cc750db0f3ecfe07d
font_01_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 10592 bytes
SHA-256: bd72051d1ac7ce45b8227890d762578ec03deeb0f426c362a769dfb7b7961222

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