Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd664a60acd0ecc…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 05:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68640846eab3d8ef4a56e58581fa2d4e SHA-1: cc0b1bb7cd425a1129c98200444044d0c1811795 SHA-256: 7bd664a60acd0ecc90361fed9db0e0e5a70a3251e2efd79559eef7f154ca0455
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into providing a password for an archive, a common tactic to bypass gateway security. The numerous embedded URLs, many pointing to compromised CMS upload directories, further support the payload delivery or phishing attempt. No scripts were extracted, but the PDF structure itself is leveraged for the attack.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413f7256ed6---jepasixakonavevajowasudur.pdf In PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/rakuragoxuduwivewowekaj.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4a105d1f79524a22c3cceaa321cdb280/85995567111.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/59336347773.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/99625402884.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/wolomesenivomopeweforema.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/35988864175.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32c670da1ebe1e72339ce31e6852c3ae/88233931353.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/37126318221.pdfIn PDF document text
    • http://falconltd.pl/cache/file/7226225325.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/90578780158.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/34320379743.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/duxixawoludapamugo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/udlfctthn7v1kroib3malalhj0/23603943267.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/zakigipafavinetuwuralaga.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/tonawodazezezadovul.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dba3e96682---12579690034.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/zipuku.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/75779876013.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/608971548.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/fokenevoguredamikokagaj.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/lozijokuzoxutuz.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/23596306361.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbcc227f4---71366633737.pdfIn PDF document text
    • https://nexusmediation.nl/files/3783593184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hack+ml+skin+apkPDF 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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 14996 bytes
SHA-256: e6e19332ecb788f5874c0b17eb09666906fe560937e72340d4fce84d334c4f49
font_01_sfnt_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10168 bytes
SHA-256: 23d1dff8f293cb8e1d9c892d8a96a222ca0c47b82cb5fe25afbf0781de0201cc
font_02_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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