Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e99208a353af98…

MALICIOUS

PDF

82.8 KB Created: 2021-07-01 23:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 108c7172574c692ae96095a3d8f34fad SHA-1: 4d97fd3573d2610531e750d20d0bd2e9ae8cbf7e SHA-256: c1e99208a353af98c94c975f90cbdda1513e2812b4cb7fc142669ea417c64465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=lax+daily+crossword+solutions
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ae02350a7dd00e75ac266ac7785731e7/labodasalapuju.pdf
    • http://tgtech-auto.com/userfiles/file/76980043217.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56b7858cc---94362894894.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3pjf98nhb8un4pu2ds3vhtfo6e/moxutebubedibekifobuli.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d143168e51---watirisava.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9472f79cea---94086080863.pdf
    • http://csc010.com/userfiles/file/20210625172658_oimbmf.pdf
    • http://srtprogetti.eu/userfiles/files/20751987576.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba286bf6b---bazinofi.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097fccb52b49---gejuxadi.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/791847cf5952579f3b0a0c6f8ab349a1/wekoza.pdf
    • http://446888.top/userfiles/file/tizab.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/newutegijuxutamavokido.pdf
    • http://ngor2-3.com/file_media/file_image/file/kavizixu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/81e6e1c9d0f1ef691414825be16e5468/81455770510.pdf
    • https://mimpisiluman.com/contents//files/bokaxapisipajig.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/vipexixopo.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609703bd6b584---16736156102.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0daca20000---93575319145.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4279deabccf6e4c3fdffaace47af64cf/82032159977.pdf
    • http://sva-jeanroze.com/xmedia/file/51220941267.pdf
    • 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_off0000e129.bin
f8acfeee472ad0395f0fa5ed4499323e1e099837109800457323ca7b3fcbb2eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 17060 bytes
font_01_sfnt_off00010d84.bin
3925414cedd62f297f67e9c13dc90a201878118b8af7e7a586b622cc0452e3ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 10588 bytes
font_02_sfnt_off000125e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 16792 bytes