Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ede3c5384b759fb…

MALICIOUS

PDF

87.6 KB Created: 2021-08-14 16:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32f6a585c964ee36005b723b32f547d3 SHA-1: 3a48587a21537ba4bd1e36932a6747715211cdc4 SHA-256: 6ede3c5384b759fbf921e12ecd8e1bdc7326707161a16d3431d94f1aba033711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=blindness+quotes+in+oedipus+rex
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3cf76393---gerabixebokipogufipogod.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/40497460933.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/cofi46pjglqc5fc5l66pj55bk1/wesibupufololawonosotoma.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b770707c629---gaxupalufilawuvenosu.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d0190671---sububunuw.pdf
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/nimijidagumakobiguti.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da14bf291e---16426633005.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/42294ubckrc52jochao25hv5ld/23587833716.pdf
    • https://luminex.pl/upload/file/37284283992.pdf
    • http://mrhobbscoffee.com/images/uploads/file/mikujowizu.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608983ec39383---wabutobizimap.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/692b94dcecd5bd579b6427fe9000e0d2/tadopos.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/93162700420.pdf
    • https://living-stone.lu/userfiles/files/padesigukig.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3fd8d66e86fe0748d160601c39ee7b0f/jezugodib.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/18d46b31f893cec15fec3d4e82985d93/33402706930.pdf
    • http://wildpflanzen-planung.de/file/xejividifuz.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5c322d4b00cf524435face71b0125ead/ridekimepor.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d06ba85002bccdd44f4511e2dad6760f/62100007922.pdf
    • http://eprdel.cz/userfiles/file/472477772.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
font_01_sfnt_off00010c82.bin
7ae456afcba4f6889fd9f7b77479384240b441770d55ba2b68402c8034d6695b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10624 bytes
font_02_sfnt_off000124ab.bin
ecdea122998a85d2bad71880d03a7330c39a79140931a35976de80a506877825
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 16988 bytes