Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f47db1068348aa…

MALICIOUS

PDF

78.3 KB Created: 2021-07-31 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 12d5bfa8ac6187080d932bce5bb042a9 SHA-1: f3f08be65be022945cc52dfd008d8f8c42a0f312 SHA-256: 81f47db1068348aaa910f8b3697945ce86d27e2fedc5387e515761041150a06d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to malicious sites or for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://uniontend.com/userfiles/files/nerikabudemavademek.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/30558750864.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/84e247a728a7cbfdd9c07bb6dcd7fd4c/dijagemenimetaw.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/wipulana.pdfIn PDF document text
    • https://go2germany.ru/files/file/dulagarumuvafag.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/77055828830.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/17274af24e04a5ff44639805c623b705/baxijumogewapikelogonuvu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e63d6d46447---46202690984.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/55931256797.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/jovamukevikujifowifi.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/76618822273.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/resipuwemopenisisupodaj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcd2989f7---74390083724.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/xipinuxujadilof.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606d093d9fa97---50877787865.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/89429603103.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073e04545f87---7433050309.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e96a6a9fe437ffff6e1b06db81a33a2d/xisejalibuvedapazoxazof.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/90991834778.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/41064132668.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5780101a4c---vaxilevilutajexexusopu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9012e489---ketidi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0pu9s37k37sbh9datleuorhm6t/89873506674.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/81690341624.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/74462c8d00e45d4e47a4dd2026de33af/puwam.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/93090128922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=biologia+3+eso+santillana+solucionesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 20284 bytes
SHA-256: 0718d4209b1a3e8f68f89b0e5835c8fd58d74419f25d56455ff2fa25597db362
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10628 bytes
SHA-256: 5e3bf7f27486deb0ec3abd6356cd43fd235107b88006795574caa09420154478
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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