Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2dbcf6ec4c984c…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 11:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 128683d2886fdc1f6b8f72d24e71d1c3 SHA-1: 6607429ac99fa1949c33119ef0cbcf6fb779f7b5 SHA-256: af2dbcf6ec4c984c3a31973421d17721557bdc47f92d0405adf3e1d64b3af354
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://konferencii.ru/js/ckfinder/userfiles/files/55316073004.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bf031af084611c3be3c43cd3cc86451b/88341785453.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/meteb.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210731092827_1828157692.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/48513821896.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35756356cb---88668700148.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/2156754641.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f8089a01b93cb1f061116fb3c6d2513b/xaworub.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gokumuveduligabat.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161255e752c92e---womorur.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/sitajat.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/boduxipo.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/80935825373.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/41866116217.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/64275100531.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/51927407715.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/rawevemotofafodejejov.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/13555035165.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/21414233756.pdfIn PDF document text
    • http://jucal.es/images/file/jonexuzewoza.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/motevufelamekasepaviwud.pdfIn PDF document text
    • http://laduses.nl/image/file/15697692213.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/sagebuledixir.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/da047fa4059b8aa4a060bb0efc72d35d/zozedelimatovamelazukurix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+components+of+multimediaPDF link annotation
    • 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_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 18292 bytes
SHA-256: 44abcc85806b787d8807f36a7a317170cd0fbf723c44273333497fe81295424c
font_01_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA8 10976 bytes
SHA-256: 2570b1edfde2bc8f7118152384c43ab71bf231f43d25cc570ef933e074bfaf27

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