Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb18021d620539a7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 11:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4872e4ea8510366b600e915afae9667 SHA-1: 8c5da1a44f6fe813c4f5fb5fab794a4e3c0b3d77 SHA-256: cb18021d620539a7043154e18696e1080e29de63af7abef7e9a94c7bfdcc54a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS uploads. This suggests the document is likely a phishing lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=environmental+problems+essay+pdf
    • https://xo-sound.ru/userfiles/file/30809629810.pdf
    • https://egokituz.eus/files/galeria/files/giduxufirelodadawot.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/fe5785250757a80f50ec34bc1d645d59/gakutoralinizeso.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/93927273192.pdf
    • https://steammining.com/userfiles/file/92915943711.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9i411k2t78dal8lh9siq00vp95/fofikomivamunotepafen.pdf
    • https://birutelorasin.com/contents//files/2789167132.pdf
    • http://zoldjogsi.hu/uploads/files/2559563385.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9461830a---8161729928.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1d41de22---fobesiga.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/52637225060.pdf
    • https://aimhc.com/userfiles/file/57038243080.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/40330693307.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5ddcbae77f4b71b7b3969c5ffa5baa6b/pakorojixusafejavirasivok.pdf
    • https://exihomes.com/userfiles/files/48030645534.pdf
    • http://amandatravel.com/userfiles/file/tidinuwefurolugasanave.pdf
    • http://myblindz.com/fck_user_files/file/53068230584.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a74a79ae4---funodixeletiga.pdf
    • http://peneleos.pl/userfiles/file/zozoxeremebirojazijazika.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7464b4206---98697386948.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23f.bin
acd800c0ca5ee690fd09880c4bc0cd2b84c398a31d968b0685ff72fa26e7ba00
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 17348 bytes
font_01_sfnt_off00010ed1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 16792 bytes
font_02_sfnt_off000126e8.bin
6f0c2152d3d1bb415db3fa3874b372bd7fc09a8b00656575fc674fc637458030
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 10960 bytes