Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26caba2d857a037…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 09:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 407f9409096565934b3b83c758ec7ced SHA-1: a1f9aecb1d9ebe38456c4f38166e12fd3383aaa3 SHA-256: f26caba2d857a03785c840b0869d69ea9ee8e0fc7eb5281cb5fb76b024c1dd66
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate it functions as a link farm on disposable hosting, potentially serving as a lure for an advance-fee scam. Embedded JavaScript was also detected, suggesting it may be used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://hesexpo.com/img/editor/image/file/24855416431.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7oc1mjqd38uafqbpc8hhtbgb17/99813731788.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cce66957---83636487928.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/90294018170.pdf
    • http://hersheyhigh1981.com/clients/37302/File/98050795507.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/88846412a77a58be9ac5a57e0b9ac4be/98885340468.pdf
    • http://dansensvenner.dk/imagesfile///gewujomafuvowirokot.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb022d7694---bawino.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca6d5a338---vajolutuwosuwik.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b225d7892db---83211935211.pdf
    • https://bbpartner.cz/userfiles/file/nosokifaxawozemuna.pdf
    • http://firegallery.ru/img/upload/rusezadod.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075de2675fb8---59786864466.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084919fedab5---34088469980.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34833d3df---13257052249.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607357d78684e---wabuxowugivowon.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4408b799bf---63298020081.pdf
    • http://mamam.by/upload/File/file/58248702147.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/lajetidomorijes.pdf
    • http://www.sport-konyv.hu/userfiles/file/lebunanuxemerop.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7de08b1c---vupizaxarakonoxikomudax.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/potidifadisitubug.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/doag6fnnsp7k024qhg70i3384t/tikuwekidiza.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2d13eab045e66d230774b76d54ffca3b/64405438223.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cool+things+to+do+in+minecraft+education+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010348.bin
58df53b3e5e9ae8eeae944ce72a9399cf1f040b4f016dbbe9f261a1999983665
pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11052 bytes
font_01_sfnt_off00011c9b.bin
e2962c3fdfda807379441b8505a72cf1092c09cdf9ee8b77481d1c9d2b43f456
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 17700 bytes
font_02_sfnt_off00014b2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2D 16792 bytes