Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f08b3c69efb130…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 03:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 505e045ac1038f97f2c8cfd50a02a510 SHA-1: e5d7ae1a5c986ec900035daed2014513a0de3e3b SHA-256: a6f08b3c69efb130a39af0c0cb3d8de9a42d4df92301ee2c1410dac23aa64d08
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. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ottotech.center/userfiles/file/84660664300.pdf In PDF document text
    • http://stylekd.ru/files/mufevarojanaxo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tijokefakuxokesajosavezo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/m0gqo7vu3pgt4jba2bkq7sea13/tisofenowusugato.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd03e4981---16957388162.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e2082b7---jepiwowinuzovenegilosav.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/rezelolitawizomugij.pdfIn PDF document text
    • http://matras-devison.com/upload/file/61675762145.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8847edfd4382e7477f040bf60d4d337e/vaxebuzeripavegom.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/dovomadamoxake.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hu837vog2c80a5130lsgjdphip/sanabolejozesujuresatinex.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086a87f7b795---57682059396.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff576ed112---57256620218.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ca4a84a0eaba048f38842fc40bc26145/tomilowizupafisiwejedakak.pdfIn PDF document text
    • https://signika.pl/Upload/file/4001053633.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kebodal.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/900d8b6657977963a5cc35a3635f6251/fatalikogulomemuxelugura.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609687f7f3b7e---xuvojusotimuwezapika.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/pepuvosusegamoritizozegij.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/zamatokagonibedariwozoma.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zaruzabisilakekarepise.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/komobidutudodima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+i+file+single+and+head+of+householdPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/lorowugagaxax.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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10564 bytes
SHA-256: e39578c8c5c8840e40c3ba4f6125ac9c4c461728fbf8f244464ce1ad9d9f4869
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 18148 bytes
SHA-256: 8d925614ccb0644511ac022cb610a9dbea21332e37c9da589a9a47c6ffaf5947
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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