Malicious PDF — malware analysis report

Static analysis result for SHA-256 be382a6ae953252b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b007a37b55ec74b6c01396c260e20393 SHA-1: 227c60515c1156763dcda9f688e81462eb9ab188 SHA-256: be382a6ae953252b4841007c193c226b7dd5df654c6323d3e341a1d353bcf531
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links, many of which point to potentially compromised WordPress upload directories or disposable hosting, indicating a phishing or malicious content delivery attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://julianowka.pl/ckfinder/userfiles/files/63947666436.pdf
    • https://przyklejki.pl/userfiles/samerogumev.pdf
    • https://nomaquito-travel.com/editor-images/37333145048.pdf
    • http://villkasz.hu/editor_up/resaxaxif.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/13936577473.pdf
    • https://mobiligennari.com/userfiles/file/talefif.pdf
    • http://lifeline-sports.com/files/file/65971760613.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/nepojukidolejifam.pdf
    • http://studiofantino.it/userfiles/files/darugopiwi.pdf
    • http://kiiga.ru/userfiles/file/birukokodekubopex.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/33769513035.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/95553988534.pdf
    • https://etadelloro.it/images/file/raduk.pdf
    • https://osakaav.com/userfiles/files/riwugokozuj.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/pitagavuzil.pdf
    • http://tecnoservizi.com/userfiles/files/59262870802.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16145a0cae3c41---70200077636.pdf
    • https://fceresources.com/ckfinder/userfiles/files/81622816105.pdf
    • http://citysoupsbellevue.com/uploads/files/48393565870.pdf
    • http://sportgalaktik.sk/userfiles/file/likapagugiriga.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qap9ammqv9hk6sb29v70i9khs3/27328249546.pdf
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/13586739755.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15e8b04d8---gaxegafagixesavafa.pdf
    • http://pileshoppen.dk/userfiles/file/29288298289.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=day+one+journal+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_off0000f12e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 16792 bytes
font_01_sfnt_off00010940.bin
2a830ddd96a579091756948f45abca613349a16c2ab24b0171a273a5ede33a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 18108 bytes
font_02_sfnt_off00013824.bin
2765231fc658a10b019cb0fbff3308f8c8994209f3edc570b7d82c435cfffdfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13824 10320 bytes