Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca4b3d66c0dba0e…

MALICIOUS

PDF

79.9 KB Created: 2021-08-27 15:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d14ce5d72ac3e199c8153d2de31d745 SHA-1: 133c776e12f3114b4509d0a9c4403ae053bb625e SHA-256: 4ca4b3d66c0dba0ef9c431a45222743e06066f1545ee3e841a996215c4a199d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://people11people.com/uploads/File/55492340843.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b13643a0003e4097e657c09c11255f3b/katunajiwadefe.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf5f54c79a---59879855075.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2af73558---72519977733.pdf
    • http://jingyilin.org/uploads/file/namanoxidudo.pdf
    • http://headlinesdinerla.com/uploads/files/nojabozalodizomeziji.pdf
    • http://sakem.org/userfiles/files/82883363.pdf
    • https://vgi-vn.vn/app/webroot/img/files/gobuxijamitufuta.pdf
    • http://chuaphucluong.com/uploads/image/files/79851709450.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/827246141e5ae0555829971fb79a675b/laferusagiruzaboginuti.pdf
    • http://thanhtindesign.vn/uploads/image/files/78017569586.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5a5d82a9---61949968636.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/19ecc1a62571e417e923ba2c83e4ae01/68624591076.pdf
    • https://bandotrading.it/uploads/file/damunomojawazuduzeripi.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f3a28048a70dcb04afdf1dd80d375e9a/8578096940.pdf
    • http://goldmustang.com/files/files/josofojikadogupodab.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6da3f3811---zorexawubukikujipojunob.pdf
    • http://gancza.pl/userfiles/file/pigajapimunerizuj.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086edf15a579---99807289564.pdf
    • http://chupanhnoithat.vn/upload/files/dedubujesifeme.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/feripaxaronevol.pdf
    • http://tafoto.de/img/upload/files/wedeta.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/mijapiwanenumili.pdf
    • http://alianzablue.com/aym_image/files/xerizomademezukufago.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=another+word+for+connection
    • 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_off0000d699.bin
67ee3e82e50af5aca55f275f147e406c0ae41328bd9f17ede8aa88d2ac54bc28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 16912 bytes
font_01_sfnt_off00010232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
font_02_sfnt_off00011a49.bin
e27fb0e38ae43e13e4a5aa94c2b5c00a9157131c3af8457fd115866225920d19
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 10264 bytes