Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7b894b656e8dd3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 23:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7f3002ba05f8d91a817bd728a995386 SHA-1: 1fd3fca0e3e06d200d7f6c9cd3a19983999877d7 SHA-256: 8f7b894b656e8dd3d25b317ac2caa3d8204ae13fcf1065ceb2ec41b6d9862a3e
156 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 probability of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=jumanji+welcome+to+the+jungle+watch+online+123movies PDF link annotation
    • http://havefuntogether.com/image/upload/File/dasugofexufebelosof.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/56794336100.pdfIn PDF document text
    • http://ippon.lv/uploads/File/82386960042.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///51649627003.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/86169570789.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/vobizotivabunogotarefed.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/46359341350.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/15780851754.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/88412222659.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/fapezotezofumezalo.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/74900365150.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b859c32456---fesifezotoresimuwakip.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48957763418.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/vavudolapezewi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/xawerelexonosu.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/8927588000.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a8238d70e714cad9b74e645c94dab01e/20203988025.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/jarepavalidufetuv.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/13954424514.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/76514068765.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fafifopoludumarowaj.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/03ad28b86c4fbd2c7c73025cad0c42f5/1633136991.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/basit.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/66795549054.pdfIn PDF document text
    • 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_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 11296 bytes
SHA-256: 35447e9eeebfb98742506072b6c1e0e13d7ff27152f2635a084ed146e1ea2484
font_02_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 17884 bytes
SHA-256: 729088203f36755a6d3dd7da3bce3adc6ee3c3936c7f93a6fab70e77a87f8124