Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a008a5241e2ffbd…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 23:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d8ad08a1a829d6309a9854fe7510e1c SHA-1: 4ea3e0e53c418e560cfab29958217ab1eb14d75a SHA-256: 1a008a5241e2ffbd4693bba1cc451f9804491c40e52fb1d84f8c6c0b79b81a8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=video+morphing+app+for+android PDF link annotation
    • http://vectorma.ru/uploads/assets/file/18626008003.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/92863475109.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vaxuzavobu.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/34766491873.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/69375877702.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/xomoj.pdfIn PDF document text
    • http://101balkon.ru/upload/files/kuzezatebedi.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210909025410.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xisimamopik.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/60927524067.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/pakolurinupebekaziwidesu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c346077c42---83250700550.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/76212250064.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa9ffbae19---newusenumajogoxekexewuwu.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/kevoli.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/11893166640.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///389267426.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/riferidimawaduwafezojiju.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/14894966806.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac86e5b3ea---welesapijiwuzugivewitebu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fa6c0f22---99381134629.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/77929589602.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161452259ab9b4---jifutawikifotu.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fobokobi.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/fatamoku.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 17332 bytes
SHA-256: 79c9624ed3f06ce98c23058f9b6bb9797f75941350de98d4acf59da874b1cbc8
font_01_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 10600 bytes
SHA-256: 56746060798a996dc2a7cc8f1ad12da1e688e40b9369f53f6a2467d82125534d
font_02_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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