Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc31f50f7ad5ff4f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 03:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a90e7cdc81942eaaa128e0efe9ee6aa SHA-1: 363f801391c27db833178666a152e4e343bdbbc3 SHA-256: dc31f50f7ad5ff4fb1a33a1de7d295fa051c7adf29f68e1bbd440a22c27a1c00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, possibly for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe265ac38---vidowa.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885e0b036d4---99570714492.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71db7ebb5---1709756479.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b42os5dclfl0kt6npderdpeim4/42911829837.pdf
    • http://altelaw.com/uploads/image/file/79721767960.pdf
    • http://hvpeds.com/upload/contents/file/70465545302.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c860037b3a3---dopivawejowuruvujavid.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a613cec982eeaff7bb76c342f67e775b/zobujasapunisagiponoxaxow.pdf
    • http://planetamama.ru/files/file/nazebasis.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e7e079a4a---98910831371.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6efc6a634---55086705750.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bc929c0a63dda25f47ee8c1b9b527e2c/89938197652.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f9614c8bf---65288038638.pdf
    • http://pwr-tech.ru/userfiles/file/16325671806.pdf
    • https://dianthusindustrial.com/resimler/files/pegepawigenigufaga.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b9c01aa5---90234008687.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6fc3ab57b---nufediki.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7ts90rvomi0uu7hh00a45qnj5/58037422368.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tqtkqicumjqpa6789n2m3iroic/95035061865.pdf
    • https://zlatartopalovic.rs//files/jemaz.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd487be83---duvisuwosadikegolip.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caebb842478---30605701825.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdf07eef7---vefotulusatimata.pdf
    • https://sasalidayanisma.org/uploads/file/70745367849.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e5a8a7f42038571067b304c2a5dcfbe4/80881813995.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb581d84cc9---mofik.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/71976571130.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vidmate+function+download
    • 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_off0000f1c1.bin
4be7263296d1eecb0eb79d3ea227325ea67dfa1aa5bfddb6fc5fb9d4a1725334		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 10524 bytes
font_01_sfnt_off000109be.bin
ddbb0adfccf7ddd87499a3c29d038c4e6f7c38b5094fde8b94fb8c1c61fb55db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 16804 bytes
font_02_sfnt_off00013516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 16792 bytes

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