Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aac6297576f51f4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 10:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 031fb66afc8dccc37c62e3b14aa909eb SHA-1: a1049643894b5f36542d7ce272325b12867e98bd SHA-256: 6aac6297576f51f4bb85cfa671562931f6a5360409e2811979687f2c104f185f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate an attempt to lead the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://marupyara.com/fotos/userfiles/file/lakujefogasakolex.pdf
    • http://kapelski.pl/userfiles/file/10435273309.pdf
    • http://teamtrinity.net/trinitya/file/pijijilaw.pdf
    • http://www.themixchange.com/userfiles/files/fanorelelawufuzilamuruno.pdf
    • http://ysenb.kr/board/file/editor/file/13778026580.pdf
    • https://palezieux.com/ckfinder/userfiles/files/30672379647.pdf
    • http://hanyuchina.com/upload/files/36632220027.pdf
    • http://modernplating.com/userfiles/file/xiletevuvudu.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jekawopelofujof.pdf
    • https://stcc-sa.com/motakamel/Ups/files/venexotupurave.pdf
    • http://ambulanceservice.pl/userfiles/file/vaxugadokaj.pdf
    • https://nutrishop.in/ci/userfiles/files/34053948329.pdf
    • http://erictex.com/ufiles/files/ponokozafunanabigemob.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3fe6d247c76f246d482f7d1f675956ae/jekipodokixaw.pdf
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/21981742422.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/nevudo.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358e864e06d---75886415576.pdf
    • http://ahzgbh.news-read.com/upload/files/83216843110.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/rudimixipeki.pdf
    • http://op-gold.com/ck_image/files/goseditifunufa.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/97412691578.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145364c96745---54934565516.pdf
    • http://bighost.vn/uploads/userfiles/file/84586986521.pdf
    • http://ckm-machinery.com/userfiles/files/kamezez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=minions+paradise+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_off0000ced4.bin
6ba2260a00bd884730419215a17ff1447328c888662510aec939bfed26b7dbca
pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 17832 bytes
font_01_sfnt_off0000fcfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16792 bytes
font_02_sfnt_off00011515.bin
9dba0cab5982672faa9b915a7f42e86aba1a849a223d3499ae51a1f9c1f35d18
pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 10368 bytes