Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38b39b73a8fad2e…

MALICIOUS

PDF

105.2 KB Created: 2021-07-19 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a67c60278a4fb80df4c4a11e1910ab4 SHA-1: fa442876e908d60260037922ca385c9e18ea256b SHA-256: f38b39b73a8fad2e02ce5f102b0f73adde6e3ca7ea4a048d2cdf6b5bd072080f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or conduct phishing attacks. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9309

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a3fc594fada7678fef4d6bb5966f53a1/50575733372.pdf
    • http://dagmar-e.de/userfiles/file/fagupamomowaxizixefiv.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2ef817b9---88236636766.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/dilenuto.pdf
    • http://crocepadrekolbe.it/userfiles/files/pumipef.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccd272ae01.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fe05a97991f8c9e6f5e0808f9d9e0dd1/30855907157.pdf
    • https://sport-jicin.cz/dokumenty/xovopapimipidu.pdf
    • http://ombs.ru/uploads/files/69600392641.pdf
    • https://ntiverification.com/userfiles/file/kejituvuwopefu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/802f125f21db4d86a17482204464997e/xodarofejeg.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/i0co5vm4qvt8678582bd05ckfb/lepobufupagavopili.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608402194e8f1---kobugap.pdf
    • http://veraschwemmle.de/fckdata/file/fabuduvij.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a05cbb05---42794986814.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0q3fj7iji263hnf1nnooiaq11l/69456186329.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/65916824502.pdf
    • https://alternativecarrepair.com/userfiles/file/dabupil.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cb3a645a---luloguwagovavozeles.pdf
    • http://avision-italia.com/userfiles/files/86699361105.pdf
    • https://clove7.com/userfiles/file/xevejawugurezeb.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160908535323d6---wufokimujapov.pdf
    • https://smilepaper.tw/archive/upload/files/40362767285.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2fd33d230628a52ca0d74ab3b7f937a3/sololijegunapesov.pdf
    • https://ebooksweb.net/files/file/safaxebufakabasulegavimor.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/goi9k9d3mrmjsple6n39fv1j92/dozatebovotivanowusata.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/v571kjdi9utjh1989vtajcgq64/xuzodafesuwubazapunati.pdf
    • https://www.indian24news.com/video/watch/pokemon-season-22-episode-41-pokemon-sun-and-moon
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+sun+and+moon+ultra+legends+episode+41
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a7.bin
3180540981bce4ee3d2a50362d793af81b6bc968d1998f934c37c9ea9f75470a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 24480 bytes
font_01_sfnt_off00012e20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 16792 bytes
font_02_sfnt_off00014631.bin
28a22ce0b477b107064db682394e47229b435a34e58243c07c4b85670d8202b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14631 19936 bytes
font_03_sfnt_off000168bd.bin
20e767d321a30623fe4a43dadf76c920fafb3423597d22685eb0259387bb11dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168BD 5600 bytes
font_04_sfnt_off00017c5f.bin
836f8418d2dfacd65d16c4226661aeda6bd324b2f63d4ad715c0d3d5ef863c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5F 11060 bytes

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