Malicious PDF — malware analysis report

Static analysis result for SHA-256 17950e63399d5759…

MALICIOUS

PDF

95.2 KB Created: 2021-09-17 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02c38b8e9def383e2d7a6746ec019f06 SHA-1: ba27d207f2eef276fba709cef46ef9150fca96bd SHA-256: 17950e63399d5759f4d6e400a6768c79c17b48e444c35da7dd2841b742689f91
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=top+follow+apk+instagram PDF link annotation
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc85a4e8e---42237470799.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2892406362.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/95ci54hpq8imq8q7oe0kj29rhc/zodidemebugigokutufa.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/bebemopowaxarikema.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/5407896177.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/47527312045.pdfIn PDF document text
    • http://katela.net/userData/board/file/kinutigametomi.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/75192405862.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/92522683323.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/bekokibewuderatefotex.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495575a851---fuzisixepog.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39382399198.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/36613927929.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/11173590108.pdfIn PDF document text
    • http://hydrem.ru/images/file/11230009975.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/66396232204.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/64095082034.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xikujufamimetovofi.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/gizofejajoxi.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/1726061188.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/tizatiwufit.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/38873174277.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/99602568736.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/kixisa.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_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 18416 bytes
SHA-256: a3883b0ef447baf1abb944d785cabb542ce616132bcf320ba7a0c948a5effcd3
font_01_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 10708 bytes
SHA-256: 11a964915de520db50ba07a5fb25510b80c9c613cfdcf26654c59fd4ae0c4b6e
font_02_sfnt_off00015728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1