Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeaf287c97baabb…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 07:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ecceee632974551ccb3964b9bf458c6 SHA-1: d7647dc37dd13d0406c0786d4b349b20ed35052f SHA-256: 4aeaf287c97baabbb438d46d4978f4f6ba4588c4adf522d805712db5fca59183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=android+1+jutaan+baterai+besar
    • https://igraonica.me/userfiles/file/jetegixusurisuvuf.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3417380a---newol.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929f5833a5---tituruk.pdf
    • http://analogsys.com/uploaded/file/17581575416130f78615fb9.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a178df255f---zabavazobojovugamasenogi.pdf
    • https://marathonblainville.com/userfiles/files/piloge.pdf
    • http://robalton.es/Albums/images/file///jovavupavekotofurazawuz.pdf
    • http://someteme.com/archivos/_20210918085309.pdf
    • https://torgradio.ru/new/files/file/rijoga.pdf
    • http://pitchdecor-construction.com/user_img/files/28875866029.pdf
    • http://marchmont.ru/imgs/file/51736159694.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/letozugugupijefafitoloz.pdf
    • https://my-natural-style.net/upload/files/65341202777.pdf
    • http://lyzjkgm.com/d/files/79283286841.pdf
    • http://kdbelektrotechniek.nl/uploads/file/bedudokuzijepujukabibi.pdf
    • http://vako.vn/app/webroot/uploads/files/40068961721.pdf
    • http://imdad-egypt.com/userfiles/file/23955994918.pdf
    • http://yuilchem.com/userData/board/file/81699169433.pdf
    • http://mopron.ru/upload/files/10929790797.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/13164972724.pdf
    • http://rogersdesignhouse.com/uploads/files/kuletob.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/75edbc429a343506031c739e4cf4e751/tuxumevamelejejajoxe.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_off0000b5d5.bin
262169d74f7bdcbbb14e18fafe414b8f8c27a77b81affd26097952e5558a0108		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 10600 bytes
font_01_sfnt_off0000ce34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 16792 bytes
font_02_sfnt_off0000e646.bin
cf9785fd2783b070a0077c90c6b68a5bd1b6d908f400ffbb4bb9bc2f60a682d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 16364 bytes

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