Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e50fd241231e86…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 14:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03a09627975fe3ff3dee0eb211bf83b1 SHA-1: 6c39208a8f9bd0985a964f6dedf3d423ef28f0ca SHA-256: f9e50fd241231e86752a944899269f790ad08d8aa15bb10ef29ae2e0790ed835
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://synerhu.ru/uplcv?utm_term=scale+on+plants PDF link annotation
    • http://wang023spa.com/userfiles/202109file/2021091722460870554.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/varetimib.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nijebagobozajuza.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/78078964678.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tijazozekepisebiwi.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dujaxopi.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/gejewelinek.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/42babc43818a0d1fc2d70a0b59c8f60a/zosidabegat.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/gopofamawaxuxug.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/52895673777.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/80615417761.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/93703644421.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109101915479000.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/nubewekifugolujexel.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/seraropejinifi.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/41050482421.pdfIn PDF document text
    • http://attlas.center/userfiles/file/63200084386.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/70593216897.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140936d10977---52427893915.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/63737286706.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/rumupitefipukitevofe.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/41939001013.pdfIn PDF document text
    • http://sksound.com/userfiles/file/52412255909.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7b6093f1---96997796383.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/gegukilubananegu.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/99951986894.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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 16104 bytes
SHA-256: d7fde473dd81332102601ab7741b1ee477ac7b2a53311b70b98be8fb8db9a1da
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 10252 bytes
SHA-256: 248fe8213f10e87371d78c247a7bf1ee524eb994b2b1ba52dc53810e8427d7a7
font_02_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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