Malicious PDF — malware analysis report

Static analysis result for SHA-256 245815649015b5b9…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 18:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cef56eb6599a4450dd438b38ff57d52a SHA-1: 9b656264639e560050e4ba5532af3bedf84fd129 SHA-256: 245815649015b5b9efab90cb2ede60cd2b70ce6c117e9588255bdb29526eb21d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.deopendeur.org/imgUser/file/jofupaxemanoresoxadizuroz.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/44545441866.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3d6b1d90---wagixirifakavumuzajirefa.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/gitesagegivogeke.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/20333943170.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2e148aac7d6052a4d123fe6ab99efe43/felaperuvub.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/80939878496.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/affab0dbfe166fdd82d7cd97545db8ad/koperedodabomef.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/90077824429.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puxonutameva.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a570d25d458---lozisagidokarumutenivixil.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160914c96dd891---lenoditubune.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161032b1407483---julolofafixabifisiwif.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210809084358.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7450c4d3a5469088edc9cf80e005cda1/52599424038.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857df985935---baparabodiko.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/413742789f82cea393e9112be0554c4b/50800742237.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f231a7824---ponotezil.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/jujeke.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///tagexusavena.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/xepijanajixaripigozulekuj.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210728_784ADEB4534D17D7.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01dd033e0---2173778749.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jizodawekawumovapuletot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=10-2+practice+measuring+angles+and+arcs+answer+keyPDF 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
font_00_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 16252 bytes
SHA-256: 8d489a9ce6f19866d1162c7c53a324b0d6a970597c02b2f290d33362e58e3e09
font_01_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 11360 bytes
SHA-256: 001dd73f2c16eeb8bd381bd9b0f2d0c2546790097191c9a374b1084e8b3acf96
font_02_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 16684 bytes
SHA-256: 5c34ccb08173f4d27a91ff32aa278bf969618a0102d28700de01cb7734416683
font_03_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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