Malicious PDF — malware analysis report

Static analysis result for SHA-256 8692893d5bfb14a0…

MALICIOUS

PDF

74.3 KB Created: 2021-06-27 03:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04bb362c840e6250f1a547cc294cfa7f SHA-1: fd8abca252b997c610fc74f0f00e1b6ca9f33495 SHA-256: 8692893d5bfb14a0f686add2a6074b768e017fffd67feb7c63645ad1fa876fa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0deeba33384a6cbed77836537434fea7/36771632741.pdf
    • http://velo.hu/UserFiles//file/12593359081.pdf
    • http://upoart.com/ckfinder/userfiles/files/lufasixamulunavolano.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094926a1e690---nasanevobegumajefafidenuw.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160864ae138430---6880587638.pdf
    • http://softwarefactory.nl/images/file/14383110371.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b305ce5482d---tikazakaxegeto.pdf
    • http://domusanna.it/userfiles/files/74821188906.pdf
    • https://micro-churches.net/uploads/file/81250181799.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160874fe1bc859---2255480094.pdf
    • http://edwardlankin.com/clients/86087/File/14341927338.pdf
    • http://suamayin.biz/userfiles/file/19172229714.pdf
    • http://www.bufolari.com/public/immagini/file/bifutipet.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2f76bd44---8286142582.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5389898be9---vubagifozusulirusejojobir.pdf
    • http://salon-urody-bellis.pl/images/file/37439438706.pdf
    • https://sonarmusic.hu/up_image/file/resetujadasafidivod.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/48490944155.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a33fb2da8---33638645906.pdf
    • http://krevue.cz/UserFiles/File/tivevozu.pdf
    • http://kawoka.com/userfiles/file/kuzogefotomuwedinelexolo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c4932979---kinibezoxenel.pdf
    • https://sabagdasarov.ru/upload/file/fivorazorofapuninabom.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fea83303c---38629139557.pdf
    • https://gangnampools.com/contents//files/lulafefobuwil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=be+there+for+me+quotes
    • 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_off0000c0fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 16792 bytes
font_01_sfnt_off0000d90e.bin
807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16892 bytes
font_02_sfnt_off0001044c.bin
ecaec26ca78199c6dc7abe82324baea75315f08eab1a866e2cd09b8cc856e5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 10372 bytes