Malicious PDF — malware analysis report

Static analysis result for SHA-256 13317fae4d747106…

MALICIOUS

PDF

143.2 KB Created: 2021-09-02 17:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9c9d8173d6fb3ba18651d11c53496f2 SHA-1: becec8b6adb6ce2e4e8f4d1829a9b82b81f7f882 SHA-256: 13317fae4d747106328e0bee0027a3861aaaf401bb6762257d238f9611f8592c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are structured as a link farm, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1eb20667---jejogamatajilidenexexawa.pdf In PDF document text
    • https://metricgroup.it/uploads/file/39062559220.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc58e85e82---74270587172.pdfIn PDF document text
    • http://alcantara.cz/data/file/larakamofexadigofuzenezi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608685c17b1e9---rilotiwiwaxefugulote.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee58a38f08bf740beb15f0a6a7fbdae1/goxejedakumaneme.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51650038360.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea51ee9607---90217074961.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/jumogene.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/xenal.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/41245187685.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/95a1a4d6518fb750b3b9e9ed52e89f22/50524006622.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/kanav.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ch2c0hskgiig61iaqpnqaqnte6/48316003180.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/6568448118.pdfIn PDF document text
    • https://subarini.ro/mm/file/welirurewepufula.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gutas.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/32922315998.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/4ab598c4dbdc09e2ebf8c421bb1258c5/67152099350.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/64153507508.pdfIn PDF document text
    • http://maidichike.com/upload/files/84744082551.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe802146c57---pezifapamolekolup.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/54926886516.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/tatumonajugetala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=diccionario+oxford+de+la+musica+pdfPDF 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_off0001c033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C033 10888 bytes
SHA-256: 2719accdd80e2ccddf3a6372c74706cf115f2875c7cd2b7af3c91b03fd776fb3
font_01_sfnt_off0001d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D95D 23740 bytes
SHA-256: d1c03e6b65542fe2f9e462e7625b53c2bfb6113594404f9003ef802c79f55330
font_02_sfnt_off0002152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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