Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9ba60bb1914576…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 13:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c2aff095350d6d305ba7325be0d3072 SHA-1: ab033a164953c54edb88ef1ce842afa228cbcfc5 SHA-256: 1f9ba60bb19145767061a2b71c3d12e68848620f6b42543c7bfeab440e915f16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and deliver second-stage payloads.

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://coretry.ru/uplcv?utm_term=normative+ethics+shelly+kagan+pdf
    • http://antifftech.com/uploadfile/file///2021061106354086.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118f1c9b06e3---jeravofufamasamasatilaw.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/keromidawel.pdf
    • http://zimmerei-possert.at/70011924233.pdf
    • http://doingthing.com/downloads/blog/geust/files/63868656610.pdf
    • https://bustotoronto.com/userfiles/file/xalewituzosoju.pdf
    • https://pasarangroup2.com/contents//files/nonewiv.pdf
    • http://banlinhkienlaptop.com/userfiles/file/kadogalibameku.pdf
    • http://tvsatkrosno.pl/userfiles/file/42747572442.pdf
    • https://imaggu.com/ci/userfiles/files/81507169629.pdf
    • http://falegnameriacastiglione.it/userfiles/files/dajiwodonewibumup.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c1a2378d---jiditexifegenate.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i813gc82mgk2havheq50uff6l0/3094582320.pdf
    • https://aravlicraft.com/cmsCart//upload/file/femekalujoruxokubis.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6386efe9284895dfddf89d2642978d6a/bodijapogo.pdf
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/42115710910.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/42971648644.pdf
    • http://rund-sro.cz/UserFiles/File/gedapi.pdf
    • http://h-n-s.net/userfiles/file/tajopaziputogeton.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb24eet7bsd19ttthbafiqr7a1/vazuwitapipedufibi.pdf
    • http://exoticland.bg/upload/files/files/ninovim.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec739e8305---jakasukejev.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/16105075434.pdf
    • http://twilaw.com/files/files/mutegipon.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7c8bc98ce6ee3f827e81c5971182fe57/93888153164.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_off0000c7d6.bin
1856c3c18da6c3f61cb1333706b2d4281b2fc2398115445e591860af7c9eef30
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D6 11316 bytes
font_01_sfnt_off0000e21c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 16792 bytes
font_02_sfnt_off0000fa2e.bin
11e849139898e375959b5e751013ffcd23180140eeaacec0298507638d398313
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 17800 bytes