Malicious PDF — malware analysis report

Static analysis result for SHA-256 6503e084c28a58da…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 01:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b922a43877cad78591b0cb2ba044aa9 SHA-1: 0965a5134f8342e9900be078ff17dd6d6a8a6766 SHA-256: 6503e084c28a58da0038d494e9a685f0bc2cbac0147c93e3798307d566c620d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The file's structure as a link farm on potentially compromised infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=pay+vs+payment
    • http://www.cenlafilm.com/siteuploads/editorimg/file/54734673677.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085502a28183---8545015712.pdf
    • http://alhouti.com/userfiles/file/27763730495.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f3def561092125a339d0e12521703223/2209279307.pdf
    • http://getem.pl/files/file/wegetiwutokowijirufetabe.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ee52de29b---58501974189.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0b0c0a62b6330de6420c9626012bb796/46736431066.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/68orb3bc40r9g7nh5lcdjga2tn/91309496069.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57fbea134---sisogezikusiwo.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608002e78a18b---12236174105.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ae11f01f20ddbef5d2f883831dc35f7d/62569662860.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3e806978---62208596944.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/jowetudezedin.pdf
    • https://ckmandarin.com/uploads/27897759182.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/iahvo2oe04g34mlkktrtjotjn3/xusifubavototetejosukapez.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712b841b17---91106106127.pdf
    • https://angelsstaff.com/uploads/file/viligaduwurigo.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7e336281bb237244829e03548ec2bc32/gewilalarenabuzaseb.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a86bc9046---83788380523.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/27975513327.pdf
    • https://majubesar.info/contents//files/55703292921.pdf
    • http://dyglas.com/userData/board/file/93391507090.pdf
    • http://chataphan.com/file_media/file_image/file/99047334283.pdf
    • https://peterdegendt.be/file/nozamagebowunisazofofeno.pdf
    • http://liubeauty.com/luutru/files/91643961782.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6626901b4---nojufofup.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_off0000ed38.bin
53770a1eb772b904cace6400a722eb9c1d43e6467fe6be9427877aaad244415b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10236 bytes
font_01_sfnt_off00010449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 16792 bytes
font_02_sfnt_off00011c5b.bin
2cf4c36f57f9c0b5077cad98b08d1053ccbf6550599cff963bdcb7550051e30f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 17156 bytes