Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aa36781d07bb15…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 00:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb86ddccdd6f7d1406f4110e3a887d1 SHA-1: e62f922c5c0883a7b92b803770254dc9ba5dd519 SHA-256: 53aa36781d07bb15ae94fb74d6989a867386c4fde32a0b31b2073c42875dc398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on various domains, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://auxerretv.com/content/public/file/winipumukefidij.pdf
    • https://balajitutorial.com/admin/userfiles/file/gupifumivevo.pdf
    • http://adveotec.com/img/file/36837910541.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e7e38cd442577d7b090e0eadb7dd7314/vafimo.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a6c67971---numasinaxuzezuraxibaf.pdf
    • http://guinyardfamilyreunion.com/clients/62985/File/migafugopexidisi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/776021d053a8c1b910901cdb87b3c1db/2012686255.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/87ad459a9116dd6289aba8c139e871c1/70916126053.pdf
    • https://hzautomatisering.nl/userfiles/file/25246219978.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ff52a81b224d658c7470fe5b9d7e7256/fatozuladad.pdf
    • http://dgjst.com/upfile/file/kefedumesopupedegi.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/af30549dc5cb88e16c67b52ccf42a238/59385071530.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/36415895260.pdf
    • https://actor-conseil.com/files/file/25458116810.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2a3347904be7ba272ecba100a85d7390/64134906411.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bj6agsbaqt3aepvrhvte1n0mmn/82301617744.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68dfc730b---48026605858.pdf
    • http://agroanaliz.by/upload/editor/files/dumokuvug.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/957821863583afcd65d311025605ae2d/22655562198.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bae44c832.pdf
    • http://adance0112.com/upfile/editor/file/biwigekikipuxonub.pdf
    • http://www.fashiongale.ro/userfiles/files/80908673227.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f7fd31b32cb679bf45ed4811f2b6fbfa/12019181524.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bengali+story+books+free+download
    • 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_off0000eec0.bin
1502258d698eb8b2f767da86f6a0d7f65fc91c97f79fcfe65510062af5ebe449
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16680 bytes
font_01_sfnt_off000119c4.bin
1a4198f19cb840a86a2b4655c3d74e1c0a14be459a9f1da2341cf1de418cb90e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 11012 bytes
font_02_sfnt_off0001336c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 16792 bytes