Malicious PDF — malware analysis report

Static analysis result for SHA-256 de08fd23e7c032f9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 06:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90e9bdebadbddbd196e29205632cc315 SHA-1: e3f55ee418ad07381e164aea334c74d10703894b SHA-256: de08fd23e7c032f9ea70fbfa20cd83391fdaae2640ce5f2c4528d8e957343b60
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to other PDFs hosted on various websites, many of which appear to be compromised or disposable. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing page or further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://widepolymers.com/userfiles/file/93173889485.pdf
    • http://timeyear-v.com/userfiles/file/pajedexeladomulubona.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/14q6b30s7t8cvrg9094dc058ci/tugoweluzajonoxekekaser.pdf
    • http://stluciachamber.org/uploadedImages/contentImg/file/pasaz.pdf
    • http://studiotrusso.it/userfiles/files/99178826784.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dc7967d8c---37156072080.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5u51nal9fk8haom2hbjl8v1um3/kixemugibapato.pdf
    • https://dptech.vn/uploads/files/74832565987.pdf
    • http://thepokeluau.com/uploads/files/tenozabezopuzejasozuzakar.pdf
    • https://ptkas.com/kingkong/userfiles/files/lekigutibigim.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b463dc69---gavitajux.pdf
    • http://myslizdrave.com/soubory/19027658447.pdf
    • http://bunny888.com/ckfinder/userfiles/files/dobudexivozofuvafukawu.pdf
    • https://careerroots.net/ckfinder/userfiles/files/ximosanevegixo.pdf
    • http://mariancozma.com/_user/file/latixexejafuwavek.pdf
    • http://xsjsbzrw.com/uploads/files/tipilabuj.pdf
    • http://fese.in/ienupdimages/images/files/dimomekijopo.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/28005243526.pdf
    • http://metabolit.ru/files/file/xepejurazuruzo.pdf
    • https://damsindia.org/admin/uploads/file/35804523785.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/11361627071.pdf
    • http://tuvantindat.com/uploads/2021-09-03/images/files/28589062390.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+block+number+android
    • 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_off0000e371.bin
e64700a97fc9edafa6726bc33f1cf3850bf99ee428eb31600f0f8616ef0c3ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 18372 bytes
font_01_sfnt_off000112b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 16792 bytes
font_02_sfnt_off00012acc.bin
f08242aff9063b2c0a8f5519a869ccdadcae00509f5eeee3b26afdab32741574
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 10672 bytes