Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cffa6253a4c85d5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 15:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ab7a23f0486b929271f2a2d87928c1f SHA-1: 0f861a2162a2787582b81c732d59160022233e13 SHA-256: 2cffa6253a4c85d53cdaaa6dc0adf5a32542f30f3e5c4f20210560a212fda910
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of numerous external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://labsshop.com/d/files/nezilajiragomajemaramulo.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142823190451---zipipameketupukunivifufe.pdf
    • http://indecomavo.pl/userimg/inc/59441503488.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/79036221896.pdf
    • https://fundoohairstyles.com/hairstyler/images/file/56253670857.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407ebb4073e---6024400016.pdf
    • http://to-tuong.com/media/ckfinder/files/61024976386.pdf
    • http://gillsandgeckos.com/userfiles/file/9498649014.pdf
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/4000408484.pdf
    • http://goldsunjsc.com/upload/files/70752802823.pdf
    • https://al-wesam.com/userfiles/files/44685453156.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabf01708f---dubuvakevinekasamikivaje.pdf
    • http://daithanhnam.com/upload/files/nawexizokisupubab.pdf
    • http://video-cycling.de/files/file/30855713160.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335ea3f1c3c---berodopod.pdf
    • https://adminico.nl/userfiles/file/63728427186.pdf
    • http://kutyasturak.hu/images/files/xizukuxedugowimedevosadoz.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/62322558274.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135226a3acfe---65153019905.pdf
    • http://medicaldistri.com/ckfinder_files/files/kewopunuxewofize.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3328toavm76luhfd4mnh5vh9no/busazofu.pdf
    • https://andana.us/files/files/8004695418.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/kojuwegoje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=marketing+4th+edition+elliott+pdf+free
    • 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_off0000c788.bin
5108d35238955f4f4e887523fe5b9f48248d994a2230686c924aa1acaf30361e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 18108 bytes
font_01_sfnt_off0000f6ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 16792 bytes
font_02_sfnt_off00010ec5.bin
92cbb7e4dd6ddf2b41878b3fb8e661fccf27c180471f4d388725b517cbc966ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10772 bytes