Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cafc71766c8ada…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 09:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5974793d266166a31f4ad70b270a65e SHA-1: 18245cafb82ce446bdf5478392a1a736663e9b80 SHA-256: d2cafc71766c8adae98a4cfbfcabf5b7f0bb3a223f7b24082373f21adc990ffc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF_IMAGE_LURE heuristic indicates a full-page screenshot designed to hide clickable actions, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://coretry.ru/uplcv?utm_term=the+break+up+full+movie+watch+online PDF link annotation
    • https://netkat.in/ckfinder/userfiles/files/16108910830.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/woledamipemodetonivagofiz.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44016108711.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148976057e18---57482427788.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/fiwanag.pdfIn PDF document text
    • http://slovoveri.org/userfiles/61186261305.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/47118004425.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/rewevuxov.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pajaxu.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109150608295474.pdfIn PDF document text
    • http://salespate.com/userfiles/file/38865595047.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/jolotejodugukuw.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c76ee1ee8e631463c3f3e25b7d557edb/tonetafatevit.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xetizudokewezemezoluz.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/21150679696.pdfIn PDF document text
    • https://gilbertems.com/videos/file/75800142506.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/16865971958.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef6db0c1e3---sosubujegexaziw.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/buwewisabomabagabup.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/jonapisidewutamipif.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u3prpnltvp21k962qi8mr4k157/kewoberilapuz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afb41400c3---3361140948.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC77 11024 bytes
SHA-256: 08b131de4ec410429c51a8ccb6ac1b0b69a8727f9a2567002b18c05f1a5516b8
font_01_sfnt_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 14356 bytes
SHA-256: 768910b6f9b627fedade3d588ab0a53433ac597de4befbb9f88f90c2a38338fd
font_02_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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