Malicious PDF — malware analysis report

Static analysis result for SHA-256 2850f2a409b80004…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 17:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 866128f749e9cb57b8e937386a171c8a SHA-1: ff060306004743069c5a314369fa5de042ca5729 SHA-256: 2850f2a409b80004f30ba1039452a6ea8d4b1f2ed017cbe35bf81c405108ba8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=sample+letter+of+good+moral+character+for+student
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6a0dcb6fb4520370eb0f6655de2d0604/biwitogubakewurumezekamo.pdf
    • http://jiangsutravel.kr/userfiles/files/20210630_225704.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/gunilinexisikamolel.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d6ddea43---laligup.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087051cb6b35---wasokuf.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7fc99f9---dikorobakumedozadu.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798b2cad41b---23531924043.pdf
    • http://hndgyl.com/v15/Upload/file/20216271758249048.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082952fa558a---vevetote.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0j85kq4e7pv84lqlt81k5av48/87838630680.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/54692908339.pdf
    • http://alpha-cp.com/userfiles/file/vulelajiputazozibopivogo.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f1d32d64---22491436686.pdf
    • https://whiteplacard.com/UserFiles/file/nigegagogalejojikowox.pdf
    • https://etimes.mn/uploads/files/loduvazotenoxex.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec13010bef---jejugevoregixamikonog.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mojarajj1rfnu9r2r5ljumo2h5/97139572966.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9lb0qla4a1atl8hioav5ph11i4/repoduzewesajevetinolexuk.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d1b5635bc0da1a06cd66e0b3da497005/lipazetunonaxaz.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/85e61ca831dbcc9e62497cb84183b5e4/41281381952.pdf
    • http://anipetkingdom.com/webroot/img/files/jimiferudoje.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m2caqcosdrqfem886qb8v6p514/jobopobedebowebezaxovug.pdf
    • http://chizclean.ru/files/fck/file/kigifolozegovok.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tejepevaxarife.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_off000104da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
font_01_sfnt_off00011cf1.bin
f2da6318397007d974c2740b7c1485ee970bf73f4a69952db1827597d263cb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 11148 bytes
font_02_sfnt_off00013699.bin
0cef50a0594824c20df79a34e05b17c613590c31f1c84c6b032f24fca495f301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 17016 bytes

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