Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fdf63c20bd487d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 717363fe7889c5af71d2198c9a2816e2 SHA-1: 43c5e31f66606f23e33bdcf258b9522d4933de49 SHA-256: f1fdf63c20bd487d7e8335a239371a5b67b8e4232dd08d5b161ad35c486a2a7c
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=yts+bollywood+site PDF link annotation
    • https://srsatta.com/ckfinder/userfiles/files/dasogijen.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/iq11jomfv2b36pgqukni1n35r1/lopasatusumikokif.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/90330561759.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/gewerizojokefejugose.pdfIn PDF document text
    • http://jljemc.com/upload/files/99053328457.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e305188ab690f654844e917345eb039f/bofazeveladuzonuwadimok.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/tovox.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/39557549308.pdfIn PDF document text
    • http://synphabase.ch/upload/file/zabuxi.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/livasupobuwoj.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/97695048899.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/2160257466.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3566b4defd9e3326da763eb57e93c14c/6934799340.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/kisibagu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/goziwelekuduvaj.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109190823429443.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/58154933304.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131d301b73da---72783547211.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/28218615948.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/67109020873.pdfIn PDF document text
    • http://ned.ru/uploads/files/ruvimevagepe.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/73806244412.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/120409558650.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5e35de63---veleludelegewiwizetewanor.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mifamavigajaxazokerun.pdfIn PDF document text
    • 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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 17000 bytes
SHA-256: 83a5a31f25b7b5da3d8b7f52bda944bd022374d3d9c6876e4c556c48a4274a77
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 10196 bytes
SHA-256: 9a98f7cf4a85ad21b50f9de49e8e0e4700eda6da9121153fedc6115253109ec4
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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