Malicious PDF — malware analysis report

Static analysis result for SHA-256 e337d314685658e6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 07:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c197b2cf0e03732e0908e44a7de1bb7a SHA-1: e7a17071fa301be678a1f7707a05b88264480558 SHA-256: e337d314685658e647c9e766f2402f604a007394a1b99b6e3b198d333054fc6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://vindindex.nl/images/uploads/ziwisibexiwidixesetalekiz.pdf In PDF document text
    • http://raylutickenterprises.com/userfiles/files/43999151757.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/pefukixexofu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131095c2c846---jurefaxezukobulevosatimi.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/rirozifu.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/69755185123.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/vupevosatamejokabif.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3c0e3e726830111f5280f0ee4e0db017/35836356147.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/86351127627.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304062bb300---xewemuvogudutaferi.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/wimatogok.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/21250761365.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/sigibikodapuvojewilepez.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/komigabofudevo.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/lefikameda.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/gilax.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jizikizonaxukuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+and+useful+apps+for+androidPDF 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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 17644 bytes
SHA-256: b57b0dadc450e5bf5c9c1f3a4967c2e63a991ba170f5f43b12e35a3134ff06a4
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 10644 bytes
SHA-256: f292844dacf52219b5b8a9f3e4e97baf4ca37f6950ec91cfe19cb9b28ad42826

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