Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00cdee002b568ca…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 07:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28be81b5ca0fd064198c21fecadbbf92 SHA-1: 716ef76e933a49319c916292c04df709fba5a6ee SHA-256: a00cdee002b568ca2819dd2dd3a90166dd5a04dcad240d1e6d7f537d8b3a6221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the linked sites indicate a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=friday+the+13th+meaning
    • https://abe-rdc.com/userfiles/file/gojan.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7fdb381b---pujizagidenufusutos.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e6e66800fd632d1965b22101943b983b/22280052323.pdf
    • https://belhasasecurity.com/userfiles/file/gulimigurixikewisevo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/upjrpr5987t38b4l0rsegucvs7/70045262746.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcc3a9afa5---nitizemanenukodomorur.pdf
    • http://apogeeconsultancy.com/upload/files/wulifuxoxajuvozufek.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/810f82a593c7d844116d944f966b29e3/suwetesukapa.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b30f0f084---zajerurasamomuno.pdf
    • https://ajur.rest/uploads/userfiles/file/75681941412.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1173c0b39---jikej.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8pah9b8msqshv11hrviahd5406/kiwuxi.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1kt473tv1iv9a21a7iri6krv34/91662426054.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087df85d4f7d---fuzavuruwidanetopoveluma.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/837d79fa17eb6719df5d865466393661/26352448070.pdf
    • https://tonwen.org/userfiles/file/53893981494.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ae31a717e73281da08dcd25a0f6e9023/mikonisijuvozoxufegejal.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608182eaef835---sopakav.pdf
    • http://ifa-astrologie.de/userfiles/file/9077411265.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9803874db52ba19d8c5aee6daf11f97d/fudodetano.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c804341b7---19373394889.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f50dc5335c1472e66782a6911729aac0/26977164351.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kkfsj8207tp2rh9a7icieirjae/jirum.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79c01c79ca---fizukusizixefajutakobirak.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_off0000f96d.bin
be0b402aab9a629feee8fdbd049733009aecd42e79e0e6732a8540ef81459c74
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10676 bytes
font_01_sfnt_off00011189.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 16792 bytes
font_02_sfnt_off0001299b.bin
fd04ca2ac3080574e88dc20713f45651558592daaf57958c56bbbb730147a4f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 18916 bytes