Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1e12ded462fa8d…

MALICIOUS

PDF

107.0 KB Created: 2021-08-17 08:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2797962eb4c4a40cf4957120d9dc1dfb SHA-1: 65b43890eb8f18fbf5e9df3c6c822d41d6341e90 SHA-256: 7a1e12ded462fa8d83309687e781a3953d487b68abb0487bdfb70f50797123a2
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_QR_LURE' also indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=cuisinart+coffee+maker+dcc+3200+troubleshooting
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d38n0hfetssun5i2m2oedteq4n/91523915652.pdf
    • https://heatingboiler.ca/fck_upload/file/77966221518.pdf
    • https://uleshuzatabc.hu/files/file/16706760178.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbk20tn0r40lolfmiblt3ptd88/56998704619.pdf
    • https://shellserva.nl/docs/Image/file/14708530790.pdf
    • http://quickvideo.nl/userfiles/file/17762990658.pdf
    • http://inse.us/uploads/images//files/nodomumeveluda.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a87bba73---zexelokobozavebijazeta.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/76608821731.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dfa3ad22437266aa65428bb0ef123b3f/82256515357.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7715f19c4efc9012c2493ddf97fd3691/68623626541.pdf
    • http://eraucheta.ru/uploads/file/zunufiwelagilububuvoka.pdf
    • http://alliusie.com/userfiles/file/fotuvuwopumigabegu.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/33668105590.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16085decc5846b---nekepanowew.pdf
    • http://automsystem.com/UploadFile/file/20210516235827443.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/98hfdnunvndo96fd7q1e725p3h/dozuvizelap.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/bd1f562415ff55e05086b0bd659ef770/nokuxabanipigo.pdf
    • https://hinodanang.com/uploads/image/files/27698951653.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d240c43028---25732240551.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4953ec8baba817dde5a94b1b34e46b31/85042492018.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/topexu.pdf
    • http://reichspfarrer.sk/file/garokupifenalasexozeg.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/20312503333.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fa4f4814c13d394d0372748d3e5e221d/zikubudigumoxalet.pdf
    • https://lbjgold.in/ckfinder/userfiles/files/28745189521.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124e8.bin
e72da3d36aa79a104e21c962501208459ec4aa7c945a9a675063560fb2884ec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 11700 bytes
font_01_sfnt_off00014083.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 16092 bytes
font_02_sfnt_off000155c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155C8 16792 bytes
font_03_sfnt_off00016dda.bin
b0838cea81cf3cde3dbbf9f7ec435fbb3993cb2a179dcf68be24453e21f29a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDA 17960 bytes