Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9d9349e1535ba2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-11 14:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50713214da8a269f2c397ef109bbf7e5 SHA-1: dfc79ac0ed0b25ec1b4de51a5f9ec192eedc820e SHA-256: 8a9d9349e1535ba243380f912d32717c12d7ae17bd5868f98705c549405bacb5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the structure and URL distribution suggest a coordinated effort to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://dishandspoonproductions.com/ckfinder/userfiles/files/9129977336.pdf
    • http://cpk.by/ckfinder/userfiles/files/vupakutexunuwiwezedo.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/xuwilexataxunef.pdf
    • http://tugrabilgisayar.net/resimler/files/95585980087.pdf
    • http://infiniti.e-library.tw/uploads/files/11848380531.pdf
    • https://phm.vn/upload/files/joragabixaseserakexota.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/69316436994.pdf
    • http://kliknetezde.cz/admin/obrazky/file/vagisowalumi.pdf
    • http://partnercable.hu/files/fesewilotaza.pdf
    • http://kielcenoca.pl/files/file/gedimesowaxazediva.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ddcef1554---fofekusirozosu.pdf
    • http://ediljolli.com/userfiles/files/rabali.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50689c923---pibakebupubulusipawamifa.pdf
    • https://szpital-sulecin.pl/images/fckfiles/file/63168321135.pdf
    • http://quaisetoiles.fr/img_pages/file/xixenoripugugonofup.pdf
    • http://maility.pl/_ADRESuserfiles/file/42273794400.pdf
    • https://greenfins-thailand.org/uploads/file/1910328856.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rexabeg.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e9f7524a---metefinisizunavuvozoleji.pdf
    • http://cancercareresearch.com/userfiles/file/zubededibuzala.pdf
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/71661560253.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/73781e3e2ba9a8230d9683b0dd4c757f/satop.pdf
    • https://orrizon.ru/images/file/73853893185.pdf
    • http://munnarinfo.in/userfiles/file/kazuzeka.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229a58db27---nebopovana.pdf
    • http://pactolous.hu/upload/file/82493114782.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pathways+to+pregnancy+and+parturition+3rd+edition+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_off0000b40e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB40E 16792 bytes
font_01_sfnt_off0000cc25.bin
58940d305c67214b637f9de6f46bf21de4a0cc9e0a3572ab57d9a1904f14ce55
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 11324 bytes
font_02_sfnt_off0000e6ad.bin
9603deb6aadd5773ead7e2c66893246cc89a30937232b8dc9b240827f33435e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 14948 bytes