Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff75bd2f2acf17ef…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 10:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d33944311f820a3ca4688172fe1945b SHA-1: 8a4453c1a45a03c3b8bc722f211ce084109be0c0 SHA-256: ff75bd2f2acf17efa077eddb25b8cde4936d8f1c943b3a06852717911dd305c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of embedded URLs and the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/781mrkpqn5rlkf27o9pd0cqpe4/danogujiwum.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609333ecc3e1f---lawudavumonipigux.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb5c68237---ruvuza.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/53029346579.pdf
    • http://indago-rovigo.it/userfiles/files/45173536510.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609938bc0df68---nivuveril.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085e469e9f76---vigojagimamuzuwixu.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39ed46637---94137460368.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb64df86b---48863706379.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7dd728c3b927507ee41c616a8654ff38/kosajiwizelimewadoj.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6c68458e---rivur.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/vefakupuron.pdf
    • https://sealskinz.ru/files/file/37601504831.pdf
    • https://evergreencans.com/userfiles/file/99952437724.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b856fb6a819063f77865f55becb20b75/wowomafuzuma.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b57210db50c095645730ce0b7784fa8c/41962147674.pdf
    • http://shosholoza.de/file/68909855579.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f704d4d7ba57f42cf2624def5be4186d/21343745661.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb57f17335e---70995394351.pdf
    • http://lightofislamonair.org/uploads/files/77238024235.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d73b7176c---sasinemunubo.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609275e434744---wesewoviw.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/77107956543.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/84866228951.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd30ec2811---48529099613.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=strategic+human+resource+management+is+the
    • 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_off0000f162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes
font_01_sfnt_off00010979.bin
d407ee0df9fe089eed23f63759ee063e5728d52e6ae635caa1e55a2eb1676e78
pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10808 bytes
font_02_sfnt_off00012234.bin
f5dec4d410a4acf1a5815d2222bc71007771ab393cfa32078c1b367e858314c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16396 bytes