Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec812e2e28bd4f88…

MALICIOUS

PDF

85.7 KB Created: 2021-08-16 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1782d069e59beb6b42d4ea31016eb6fc SHA-1: 9cdc2f2730fd235cd2db05a43937f0e0cdcad310 SHA-256: ec812e2e28bd4f889c69ad127a67949f15ff41303182fada54c26c5e0d6b335d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable binary data, indicating it's not intended for human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/juzapafuparilokulipuzi.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fb67c42f28b7fc7bd7161dab064a6f84/52689521635.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b825e44407f---delafukotidedalupi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gugugulavepikadigewowipo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/xigijaruxadukepufavu.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wobudesogowuje.pdfIn PDF document text
    • http://ligneus.hu/upload/file/4316964258.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/55245706403.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/faxidigogajogafa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a077aaa8---12643877180.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7713b8cd102215872da2f76eeabc2f8c/tires.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/fenajonafurulujatoxilafev.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/78451985452.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/savaguj.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/taxiwesatobanogitigimugop.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e73130950---pikakujon.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086a86665004---xorojixubirodurevux.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607547dc9e54b---zediva.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/jobisoxa.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/19443046038.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/vurufemotawiwobizudovi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xipurinijeretul.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/m5g91mp3jb1b0sb32hked4fg5v/fofaxonejujapoloxonunad.pdfIn PDF document text
    • https://tl-systems.hu/files/files/21268241567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+medicinal+chemistry+pdfPDF 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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 17500 bytes
SHA-256: 9eefb4b23dc7445268a48d263fe65e6902ed68ddc3d96429bd83b58b8c49cdd6
font_01_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 11080 bytes
SHA-256: b945ce86dd9e2dbfd9b853f8f5138956b183e57760fb83a071aed736625d8aab
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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