Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4511dea96fb15f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 14:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d33cdc601fc9cd54261d7f902a2db598 SHA-1: a10f006c8ec2759380b70ae82652a88ee46c9884 SHA-256: ab4511dea96fb15fea8c6928081eebce017ed4eba7049772156d9f0d763f337c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/37996965689.pdf
    • http://abbeytraining.net/userfiles/file/45787638843.pdf
    • http://utcsp2.rustyramone.com/uploads/files/semimemadomirakavefukuv.pdf
    • http://siciny.pl/userfiles/file/39244817872.pdf
    • http://stepasidemedical.ie/images/uploads/file/60240647623.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5d50af34---65007236237.pdf
    • http://hzyixiangchem.com/upload/files/femaminokidikaw.pdf
    • https://leciv.fr/uploads/FCK_files/file/65790751681.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/fenivikipojaferaj.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac96bf1bd4---gegalemuvam.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d35a60c00---pafovefexibu.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b4b8a9b90bcb94f629b5491398718394/88256171065.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents/files/xujewuran.pdf
    • http://sportsclinicwest.ie/media/contents/file/7254637991.pdf
    • http://headlinesdinerla.com/uploads/files/vavekeriletavuke.pdf
    • https://people11people.gr/uploads/File/69654072052.pdf
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdf
    • http://cmtl.in/uploads/userfiles/file/file/xaxoru.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/jafopetavobobino.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/sawomobizedevofasezezedad.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/14036171543.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/17/tujoraxu.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9e7a9deb9943924ade688c9c15cb7d92/mefibutipeve.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424dc8a2b18---96703919977.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdfb054d6---xowobajelitanaboludunij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mario+kart+64+for+android
    • 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_off0000ca4e.bin
c02f780e58bba21bc81e64ffdb0545f86c03d988cbc865b802ed653cab1771ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10332 bytes
font_01_sfnt_off0000e1cb.bin
d76641e132ff9946685672337b280f5dbcf7262a7ad909d22c8fba2aa5bae021
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 16968 bytes
font_02_sfnt_off00010d43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16792 bytes