Malicious PDF — malware analysis report

Static analysis result for SHA-256 f877aafb0e7333e2…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 19:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33ddf387f7888d23cf8abc9f8ac35e55 SHA-1: bafedd326d2afa6b6d4c97d6de601d4b9952b97e SHA-256: f877aafb0e7333e2da6574c1e642f71c05d9dc730c9b73a9c0987f68fffd1df9
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=cours+de+droit+civil+des+biens+pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4edef0ec5---jodamabolamitegini.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/70677464772.pdf
    • https://netpage.info/userfiles/file/rokopaladidarewinixi.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1627959451.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4206f8093b---robonipagevevizakusawe.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0938e2ff---rerowobagatavoduj.pdf
    • http://champagne-marc-chauvet.com/images/files/78827302568.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/20111962723.pdf
    • http://pinturasoltra.com/images/slider/files/badatadefa.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607001b1c7359---64969152916.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ebc5e60585862351338d6f6f0605c687/83254218243.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d1d45687f0e1500b641ff90d7b4a0f9f/28065796883.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989d6289b10---8753637886.pdf
    • http://bora.su/ckfinder/userfiles/files/zubufopi.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/16nt3k1j9pb8ctappic31k7skg/kojekovasafokuwero.pdf
    • http://phutungvespaco.com/luutru/files/luzosivodixibobupozuli.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f265890a6---wewoximetedijuxuja.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094671ca3d11---55282658128.pdf
    • http://ilkemymm.com/image/files/raluferuximukifoxava.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd8da41f2---fepiribesubegajejoro.pdf
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/soregavuxije.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5d1e33e1c8cac23f9b4281a1caa378fc/82315181133.pdf
    • http://rustproofingottawa.com/userfiles/file/80373070887.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_off0000f2d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
font_01_sfnt_off00010ae7.bin
801b63e637db5b0b096a3b0fb4c1c695066b477dd5833e84c6e42c81f82bd60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 22116 bytes
font_02_sfnt_off00014219.bin
b8ad10b77185bf80c8904af984dd21df2a10811a61773032af3eb7ccdf08e4c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14219 10788 bytes