Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f52007ae130a5…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 04:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8abbd30bd367e1d2fa5aa8e069bd8ba8 SHA-1: 8d5bf6499fbd680398f0c6d0e4d53b9f221c16d5 SHA-256: 4a2f52007ae130a5154e0327a68a17d834846c3644b28cf8b443ecd41c856aa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=things+that+rhyme+with+forever
    • https://rimsball.com/ckfinder/userfiles/files/wibomubitareroda.pdf
    • http://birzebbugastpetersfc.com/files/file/55884867959.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/622b996c1a933ca9d6e38d9e4606bbe2/xuxarikuvafagosojobazu.pdf
    • http://sushi-belovo.ru/files/kibadomitemizupavevudima.pdf
    • http://brandiassociati.it/userfiles/file/17953246177.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7ef80a171c8e61be0667dfdbbfb4f1b5/58440198383.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087050c61512---dowasonutivet.pdf
    • https://1877painters.com/FCKeditor/file/zafiwenigituvoxokosenif.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/qn281oqoa6n3hq0iruak8qc734/77635970382.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9255a33e64467b1c82373c7c3454a54/zimusasiposo.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a817df175fb---rosumamekawufutasolur.pdf
    • http://plusk-car.com/js/upload/files/rugufuzigugen.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dhtfl42i6tv76hadi53eonpali/30949656244.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e78c4b29e---sadipegiboratowezef.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ibbo02q1v8jkjflg8s8vet6266/jenekewumimotufiref.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff6e25822---melap.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/345a6efa7935301a29461faed06bc6ef/66033571802.pdf
    • https://baxsporthorses.com/userfiles/file/99124637283.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/477b77eb79e7c058ad76ab7f7d9502d4/zikadivazewuduxetelojon.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcc8b2ce9---mapiwij.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25c993961---gopiwusuvupobujovikoduze.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5ea990c8926fb1de9753ea88b2700428/87985261125.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bdeed618---67621570044.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4df3b351f0cb66c2508422ad55cc29af/fikinelogamop.pdf
    • 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_off0000f04d.bin
30d9c631f29080a767e58432a48ab0e92bb064ed2a029f115d5d32d66e68e0c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 10844 bytes
font_01_sfnt_off00010944.bin
5ee15aba1f3b5497aee2d4ab4726d2d66d1a8107c8f87ac8048c3ea0c4b659ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 17496 bytes
font_02_sfnt_off000136e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E5 16792 bytes