Malicious PDF — malware analysis report

Static analysis result for SHA-256 16366b674c94ca8b…

MALICIOUS

PDF

85.5 KB Created: 2021-08-26 11:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52e2ecd94f0a7ef5277cbf114363518 SHA-1: db9731102c3fe45d29101f2d63a1aefcca8edff8 SHA-256: 16366b674c94ca8b710422aaca0a8ec104d8323cf36cd5449bc06d03154cc700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS upload storage, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d769755d16a---56158587869.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61f2f5d9765eb71d6ca2155621bc6132/35856283426.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cb3c7c02df9e58ca1b1ddd890ae20a61/5446802683.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/55403134230.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6c53f8fd0527a8ba4432dfece239780a/tenosemuzuza.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4ee3cdd2ab011526f25de13dc5412c2d/81068305199.pdf
    • http://ajtoablakcentrum.com/_user/file/nikemejuxarevufurot.pdf
    • https://rimsball.com/ckfinder/userfiles/files/43725806060.pdf
    • http://seksdagen.nl/userfiles/file/54041115133.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866e2ea76e---88082704559.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/758738b73e9df7a58bd71245a450d451/16943364003.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2dd53d511580502a297ba6363517aafa/40773841164.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajilukawatapuda.pdf
    • https://burlingame.com/wysiwygfiles/file/kumagutup.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/49276171343.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612553b953c15---40425015271.pdf
    • http://simsvizag.com/contentimages/file/3464312505.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1e5a2e60f92bc70121bd3ebf931cc9df/43741067167.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca4097348---41326852007.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b14076b0e0622ddbc10557d844678800/vodonebuke.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/50442575012.pdf
    • http://abwmountvernon.com/uploads/files/99940932147.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-25/20210525023335675653.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084062c8377e---dolebemuzakuvixixodozagom.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7ac1294b3a3ba85911ed16f052ce530/5337825043.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fall+k+words
    • 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_off0000eb86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 16792 bytes
font_01_sfnt_off00010398.bin
0982b45540d9a0f7c78150c68e85f00959554e3a0c958479b88084fbde17cdec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 17996 bytes
font_02_sfnt_off0001323c.bin
3731353c871d90439853201911c3498df036722d473340dab0d120828419ac1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 9968 bytes