Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe0210581df38ff…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 17:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83c0bb362506efed857b0c145b865204 SHA-1: a202f5f25ac30bb0bb6ab2cec918b556a60e9428 SHA-256: cbe0210581df38ff3f590cea167c9e5430115265b0af64452bd918cefe5a1134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/buzekil.pdf
    • http://turnyras.lt/Files/file/revabitef.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/laloravewowirijamoti.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/joweparopiputiravi.pdf
    • http://thietkewebbacninh.com/webroot/img/files/gawixebuvolap.pdf
    • http://nationalcoopadvisors.com/userfiles/files/bowewunuzatagirivutolewib.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b006478851---35829384129.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/mitixidogadaxa.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8dd98718---93033544196.pdf
    • https://nepalihemp.com/ckfinder/userfiles/files/kimapirifadunewodasegesax.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f2c9c4eccafa2862dbb1e1342e1bc6d3/61255308872.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4f308347404ea8b30b5b787df32e7e3b/loxopaj.pdf
    • http://babamoleskine.com/files/file/xidijopox.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea4f594831fa7608842b279ba4bdb2b1/74722577290.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2c82c078ea41166ca4260499cc33dfe1/tajimakat.pdf
    • http://satcomlink.com/userData/board/file/sudofuboxut.pdf
    • http://studioarchperissinotto.eu/userfiles/files/36132568788.pdf
    • http://sanfrancescovet.com/userfiles/files/lawewogafal.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/12815881085.pdf
    • http://dintainoodle.com/uploads/files/nibewaxigi.pdf
    • https://tsafar.ir/basefile/tsafarir/files/85726718126.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/mokusalanodufuf.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/digoxuganuvon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+xbmc+for+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_off0000ddf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
font_01_sfnt_off0000f60d.bin
63bc226295e020b2af8acc6d172735229955065302b12efcdce399e970ca31ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10796 bytes
font_02_sfnt_off00010ec1.bin
1c6dd44bcbb45a13f672ed4748da9a8994bea7b1db0ffaa2557c91464ef94baf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 18180 bytes