Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9d1368f4d2879d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 18:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ec8acfab3a20ff750cb63148b16492e SHA-1: 02832c38abf186aa74c77c5631148c392b61541c SHA-256: 3f9d1368f4d2879da7cc3a88a31f15fa3ade8049b9014ce702f7a1eba36eab10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://interwork.sk/userfiles/file/96561222058.pdf In PDF document text
    • http://akgwealthplanner.com/crm/files/40531317816.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/9409586997.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/abee53b1c39da7f2227a7ea1b4d381ca/vumafenajaxov.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/5817424472.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/zakudogarowole.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/9395094397.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138cdf95f360---xanax.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/nebifu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161302ab8c2d09---pirawerijawegibabobarovu.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/74755658751.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/37926824293.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea2b9447f---weboj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321add54b47---19686909016.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81996108565.pdfIn PDF document text
    • https://mcsfood.com/images/file/60556532140.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d183151d98---11744768069.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-17/20210917081734259408.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/pejuxiwaj.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zutemolulevelukafekes.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/49511638630.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/13323166041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=different+parts+of+stomach+painPDF 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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 10700 bytes
SHA-256: 101fed96ad5e6725eed77f2efce4478334c240445f646135055f664f881e5e67
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 17020 bytes
SHA-256: 60172e8b1390576e36f519bbb8dccd3ffa550484fc6e5b8ddd4db9bbbf6cb8b4

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