Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de36ebb269835fc…

MALICIOUS

PDF

307.8 KB Created: 2021-06-28 04:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95c269d28787976308710403708e2a4d SHA-1: 458a1f3230fefb1e13a1b5e0f0e049bc122de448 SHA-256: 8de36ebb269835fcfabacb6059420b79478fb137f9cd8439618edc9d0ccadd7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9690

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=approach+almost+any+machine+learning+problem+pdf
    • http://tourister.kr/userfiles/file/99204444468.pdf
    • http://adabaskimerkezi.com/upload/file/nevaxupabi.pdf
    • http://kaitosushisb.com/uploads/files/44731132686.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b073d439d27---71320888675.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfdd13bdd1---25064722703.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160968afa81b25---domosubu.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o2piu41sg6vta84jr66fievaok/xoxitadasasepovaberoduki.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7aebdf7---98027388814.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/72560163716.pdf
    • http://bucketdiaries.com/uploads/files/7370154438.pdf
    • https://bbgpiti.com/userfiles/files/febazotir.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/24fdc02d70cacf5391f2b539eeb91c18/34022183140.pdf
    • http://kuzfarm.ru/images/file/5658587749.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a77689ac817---woterixuj.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/nigalexonizi.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77a9efc43---34092065259.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ab3cc4425f94ed15db8fa4f9c3fe0896/3072401952.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/27825034240.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/fewenasojasalodisujivi.pdf
    • http://mu-rrrc.com/userfiles/file/gizujiloperivimubomonera.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8596612b1bd8f6a26692f1588043db5b/tudutivizoviwino.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7dd157fe---67488352083.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0f1788a6---65117005114.pdf
    • http://castrolmintabolt.hu/images/upload/file/3733889174.pdf
    • http://learningkey.org/userfiles/bizomodekasugosoxa.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kuded.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_off000442af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x442AF 16792 bytes
font_01_sfnt_off00045ac0.bin
a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x45AC0 16076 bytes
font_02_sfnt_off00046fe3.bin
ead4605e7a568961683f5cf0716fb6ce3c3e52157c0671648a93fa25cf2a511b
pdf-font-stream PDF embedded font (sfnt) at offset 0x46FE3 11300 bytes
font_03_sfnt_off000489e3.bin
0a1c590feaf18a9a812dcc67d33e63e17fef0af2f663acee3a6acdf81710517a
pdf-font-stream PDF embedded font (sfnt) at offset 0x489E3 19588 bytes