Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fea24e206fb64e…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 09:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4156d18aab7c358ad12f32943f02dc94 SHA-1: 977cfb63f4a9bca8fc49ef7d6f2fe92e9c5fc142 SHA-256: a9fea24e206fb64e99a438a2443ffc966a4209b7f7f08bd1ef8cd87cd17d707f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3a1e2e31---16398596623.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a71dd2a0---rapaliva.pdf
    • http://umiyawoodworks.com/fckdb/userfiles/file/9660557674.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/92735983091.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e547a897fa---97527672603.pdf
    • https://777mto.com/contents//files/96730757897.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/7811683877.pdf
    • http://paroissedementon.fr/upload/files/gekunefavorotusijugoson.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/diirk9rl979gmmjuopdbokak37/nawikuke.pdf
    • https://dovolena-jiznicechy.cz/uploads/jofuxixunara.pdf
    • https://circolodelpistone.ch/userfiles/file/kenupoluvawer.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/vefevexegenez.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/736ca538fea1e89d471e4c29bf7d2c3f/58327099672.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/12qr19tf92nvnv9ls1r1ul556q/tisaxawi.pdf
    • https://alajuusa.ee/media/contents/file/fabovavabipa.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c1217bf1---47277311748.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160aac89860481---60510921349.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/66c37dce6ed6ba3a0b605b25cafb3783/sasake.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e2b938d8768276c162918d968d664d0d/penoziwujexokutidiwudepa.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de0a7b2e6---boguzititoru.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/kuromijamanebut.pdf
    • https://alshaabcoop.com/userfiles/file/86138998552.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d050d7772---53370145882.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=famous+black+painters+of+the+20th+century
    • 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_off0000fbcc.bin
2e138f2c8f03f99e91b5b2b8f6ff6056d626e3b6594a6490479dcf612bc66545
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 17520 bytes
font_01_sfnt_off0001295a.bin
8dd2d1d7db9947b2e06591d52945032b2b0dc1452a5fe9d0dbb5e8bc075e0991
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 11408 bytes
font_02_sfnt_off000143f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 16792 bytes