Malicious PDF — malware analysis report

Static analysis result for SHA-256 e199b776c33b30fc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 05:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 797d807d1431d89ff0dd11cda0b1bbab SHA-1: 88a838b3ab9b36f731f509272c30ac59c063c3ab SHA-256: e199b776c33b30fc16bf3cf478f08ce5c66ffd8c2e6f9db1d1ac2833e78c1702
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing tactic by presenting itself as an image-based lure, hiding a clickable link within. Numerous heuristics indicate this is a link farm hosted on potentially disposable or compromised domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 69 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.
  • 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=toxic+parents+overcoming+their+hurtful+legacy+pdf PDF link annotation
    • http://bud-med.eu/userfiles/file/52367206487.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/zipovitezetiwate.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/97921679164.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021939222.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/denagef.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/vezaxasekosumusinif.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/vasamo.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/67628239243.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/43323382567.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/xeveman.pdfIn PDF document text
    • http://archbot.pl/files/file/95981664034.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907165754158397.pdfIn PDF document text
    • http://mousike.it/img_ins/files/38153279857.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/jobuwusozanetobamerod.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/zanofajojum.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/16797872510.pdfIn PDF document text
    • https://tivicom.vn/upload/files/rufobunixunefozi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/legafalewuwefepot.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/61908264599.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/rojopedofatarojuwikosorak.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76bd829a---84569203770.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/ribimepowop.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dd5973a1e---87161405300.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767bd8932e---remele.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 11412 bytes
SHA-256: 522175770ee2de24534f6bb93b86ce6c7daa1b13765f0cfe608e7762e0ff1535
font_01_sfnt_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 13856 bytes
SHA-256: 9b6c5247bcf8a2b1941c4958cbb6ec962ba22beebb4f327926eda5220bdb6b3f
font_02_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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