Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd8b2df9594cf00…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 20:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4503ab1acc3ab1d12e3844944fb2a669 SHA-1: b5d7242a8934d613d0c710b169b3908bc667eb4c SHA-256: 7cd8b2df9594cf008c824dced0eb15a52d5e19b440229e5bf505c54124f17e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612c74810a8d3---leravozokadejif.pdf In PDF document text
    • http://uniroll.pl/user_images/file/tebevemive.pdfIn PDF document text
    • http://epmachine.ru/d/files/vedifolaresafudefasi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10ebf36a0e---wiwuxawogupadurun.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/49b765028dbd637c739e8525d86f4dd8/denamogufugi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/69c568f0b634ab3821cae238ea40a97d/52080626515.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/65514187022.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf62595a20---xigatomimezamunejosoremo.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/9039046337.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/67925133938.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/kelogipeladek.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2rmhahl2iojb3vrioeth4ip190/31086852285.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb3eda877---jixafaloxakaxerizinime.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c73455fe---68088075086.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/19220247454.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/98982392562.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160948f1753ca2---fizomivapalugaxutobuw.pdfIn PDF document text
    • http://kisito.com/userfiles/file/fexilebag.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4a6eaa78---kubavupawamowosufifero.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/27773594927.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wovigunuwi.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/87d693cf56e4b6154038a47db1b54fb4/vuduzadexojevipev.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/96116952742.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/60817368371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=eos+rebel+t7i+manualPDF 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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 19512 bytes
SHA-256: ace0afdb53b7410463c528e7f8d3fe6b8b54374334c4d99664b342e8eecf9bb1
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 10544 bytes
SHA-256: b5fb84defebb6ee0a8ebb6bf691ffed6f09ac76a1d75df6f142c3be5b6c7dab8
font_02_sfnt_off00013d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1