Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7a0a6118571829…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 14:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0172148f39a96cea7397ab67cb769e9d SHA-1: 4c1e8b194806ca4064e9e05bb5f74d8a18ee6af3 SHA-256: dc7a0a611857182973e1a1f79262202257ab2ed96385ca986569ab3b28c9087b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The PDF structure itself does not contain readable content, but the heuristics indicate it's designed to redirect users to external, potentially malicious, PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/00f830a7ca152ffa92ec323f897ed477/vewedibewixesozupumupo.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89f20ef53---totux.pdf
    • http://pusancard.com/userData/board/file/bisarexinevade.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c30966b99dd---wijefufowe.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8707df96---78815900579.pdf
    • https://parklanehotel.asia/userfiles/file/67823504716.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/075b60cc6aa631069e7c973081033bc6/91047472400.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/32fb2238e4f5ba0a9317f3d4580c9034/83876586634.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e5194d92---serizax.pdf
    • http://beergolfers.com./blog/images/file/xepiboduvi.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/grcc52avm9tvcnbiv5721o3m18/nujepasukegomepemetili.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16098dae8b535a---rusorapi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cbb7b230c---47108260925.pdf
    • https://ivanda-commerce.hr/userfiles/file/16129557253.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577da2f76c---73210887016.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16099039fd503c---30449982936.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b2b5b3459e7e333a266e5979a69f64e2/giboni.pdf
    • http://renovator.cz/files/file/dofoloxirusavamenaredesi.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606de4e7ae153---xunera.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a8eb60cd0075f0c8fe62ba5d9baf9599/98246315621.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f457e2687e---48091362869.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3db134750---jomakazokesakezevalagadad.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8615b4f09b---remes.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0267b5ae2---kotufuzag.pdf
    • https://luminex.pl/upload/file/81997078182.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=buoyancy+meaning+physics
    • 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_off0000f244.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16792 bytes
font_01_sfnt_off00010a5b.bin
97229e9bd319f8c1a5bc08e796f656367237a64a1acdbf229da06c7e4dc9a0d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 10844 bytes
font_02_sfnt_off0001233c.bin
207ee16f195574b37606e408e82403c1d9ae97aa77aa5a46bfb405c38a67e73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 18880 bytes

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