Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffbfda1da75ede6…

MALICIOUS

PDF

100.9 KB Created: 2021-09-18 08:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcfa292662eeb216c3af95d8773acdfe SHA-1: bf2af054a557b2108c3b42c5b499150dd9b01775 SHA-256: 6ffbfda1da75ede6fe9a71445a56f877a4e4e3404ed1407da37a6f58a908b801
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://csc0898.com/userfiles/file/20210912135328_582r9p.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/89300898124.pdf
    • https://raljob.com/userfiles/file/8243411227.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/fipukikepujotobo.pdf
    • http://hakasasi.id/userfiles/file/82313338193.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/48768825727.pdf
    • http://crystal-lamp.ru/uploads/files/zabivimugisifovumeku.pdf
    • http://hmconcretemixingplant.ru/d/files/wiwelagixapodetexaroto.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16142858b23877---makepilanato.pdf
    • https://skvely-kup.cz/files/file/44725477244.pdf
    • http://vstarmp.cn/upload/files/20210913_080317.pdf
    • http://brandorbit.in/userfiles/file/37094898941.pdf
    • https://rails-bg.com/fckeditorfiles/file/38306426913.pdf
    • https://ljlconst.com/admin/images/file/61015990692.pdf
    • http://dongzzang.com/userfiles/file///surijofotetafekajum.pdf
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/68054945236.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/34396269294.pdf
    • http://goldway.jp/upload/board/file/33369883418.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7dbb3124f---mugex.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/am10r87c6fktljjv6jnplp2rl9/3878959719.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351f82a3b7a---4513366474.pdf
    • http://hankyunget.net/userData/board/file/47178472606.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femudodafisulumokofikive.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/be478539222aff4e25c541a585f785b5/91370348075.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+purge+full+movie+stream
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000137e6.bin
3b22649405bd7033eb78591bba0b248fc2a445789774df2b8abd9b9e98a094fa
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x137E6 18140 bytes
font_00_sfnt_off00010807.bin
4cee0b5c2749975cde8fb7e5eed2948fa90f530d52e893cc803a557f50fa732d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 18372 bytes
font_02_sfnt_off00015417.bin
7a22f33f1796a1f2fc7d009a308a8a2bcbbef378f8f3d25dd47de5a3ff74ba6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15417 10832 bytes
font_03_sfnt_off00016d21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D21 16792 bytes