Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafd894c69b30592…

MALICIOUS

PDF

77.0 KB Created: 2021-09-23 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b3c7fffa99c7672269e827e0d4d4014 SHA-1: 744af96d65fbeb99aa5ec42e6fa24009b7b33548 SHA-256: eafd894c69b30592bed5d782f72af8cdb1e82d6571cda98739774c60dc9c7aa1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute further malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sial.pl/galeria/file/12537981642.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/gutumovofeferizefafap.pdf
    • http://tdsns.ru/userfiles/file/23132681438.pdf
    • http://clairvoyantinfotech.com/demo/images/57252035415.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614401d06ffa3---66529645780.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405441d4e1e---subenivogusijavogor.pdf
    • http://archpiudue.com/userfiles/files/feturirusasevurunajal.pdf
    • http://printific.com/images/contentimages/files/sutisabubik.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339be8d087c---24854812662.pdf
    • https://musikkursus.dk/userfiles/file/mevubu.pdf
    • http://decorstore.eu/upload/file/99847401483.pdf
    • https://myphi.biz/nbloom/fckuploads/file/1330373756.pdf
    • http://eperon-kochersberg.com/img_db/fewefonifim.pdf
    • http://kxxbs.com/uploadfiles/file/a/nibaduxisugowidanuwezuse.pdf
    • http://licausi.it/userfiles/files/nebojaxupazatureturipe.pdf
    • http://batiment-tunisie.com/userfiles/file/92902973433.pdf
    • https://ingatlansos.hu/images/userfiles/file/xojifuk.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c32a45a024d6da74ee9dacd741487cdd/71028088385.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/zexaburaloxugiviguvatu.pdf
    • https://razredna-nastava.net/files/wuramuwanot.pdf
    • http://parateam.cz/file/kavapuzixawewel.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b61855fdb---buvafukewedipenupobebotug.pdf
    • http://custom-mugs-factory.com/uploadfile/files/nojige.pdf
    • http://alanaf.ru/userfiles/files/7099088723.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=games+gta+5+free+play
    • 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_off0000cbbb.bin
b4708460723ebf28a2157a0875039a23c1ba689c29f0a5a2f2eaa9f54389c510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 16392 bytes
font_01_sfnt_off0000f5bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 16792 bytes
font_02_sfnt_off00010dd6.bin
f8853ecf2b433f22fc64fc0fe0b0940204c26a838c05cb6fc884512c35f36f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 10672 bytes

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