Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2257348981a2a7…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 08:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2f238925c5244f279461684db6656c0d SHA-1: cc4b3dbdec583266ae973321f182810bd77498ad SHA-256: 4c2257348981a2a7dceeed99523e12aa3a1a52f6f48efd636ec7b06bcf9d3d1f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites using the Formcraft plugin, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095bdd9600e0---50067457162.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b500a0f32---89868180079.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923fec1f674---tofasexalawefiwowodagot.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160899b3cc6ccc---didonukeludexojirafowowo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/oufa443jdgp97jvnmvajo8cphh/95672832600.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b195087c0db---58469391037.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210603004756716031.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/perenamareturil.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7a67eeb9---wilunegibofababebozoxo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/19d32245b13b7e0c76ee98627a52c278/tenudakudubefetut.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/05501b8aeb3f7b3bb53cef8a2cdebb33/36311459933.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/16ef03ea37b2659fa4856d9ef1eb8c55/kegiwenoboxuz.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e7c696228de0de4fd80549eb3152e33b/wosufesuzojafokodejaluf.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/93014ee6d783d688e7e4d40d4dcc6f87/teropuzalup.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d68129604---xinawurisobitunupok.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3gnmo7f0v3i7njde6nfgdaqv3c/84121245971.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a790f8ea343---nutixitusinegodis.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/74978747951.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/gapamaxavefuluv.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/44800111981.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/77104259572.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/hamgs5l2pnntb9veltls5l2grm/65299601435.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1b8404e3101a41a3ecf036a1a7e70c77/15331871085.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210621/file/16242571357471.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/srk18een46k20bvg9qkbb8vd10/50805494804.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c682cce6aa1---xalilisasajedu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/terurigidun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=equal+chords+of+a+circle+are+equidistant+from+centrePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF241 18328 bytes
SHA-256: 3635a58299124ed8d81d17b679553b5e6d981e477c50d1f3c597636e15ad935f
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 10968 bytes
SHA-256: 559871737bb08feb8b669b7e26b990fd0a7c588dc95f2f7bfc2c5232bc7b7e4e
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 16224 bytes
SHA-256: 7d021a1735e72e2d4fd16d1750f0e82041cf66baca08667ccfe38d67c512953f

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