Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54d8cb6a4755396…

MALICIOUS

PDF

183.3 KB Created: 2021-07-17 04:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44639b08610201ffcfa87ef6d07fb074 SHA-1: acd33750594ec96ac55a6d31264bfec323cfec02 SHA-256: b54d8cb6a475539660a8464110c9e0c541686e9683b4f5fcfbc7e3f40403e08f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8527

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/734e01ed9e53c157b1b3d8fa2915c85a/dunajanuruzo.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rkbkcg4va7ib57ht6bstsclhj8/92824397158.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fdab5070d---60062621810.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b35ec66ba---4735179335.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/korisunitunagitupaniridap.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54164a52ff---14504192596.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b5989a3b16e21200c564ac83bcbca8ca/85442682552.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff052c252c---53737878079.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4pt9laa2d2p4t1h84ncr4jk4bm/sagalani.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d106a2c14a---24818191071.pdf
    • http://szzxwx.com/Upload/Upload/file/2021618171506325.pdf
    • http://grandinhr.eu/images/user/file/60388105039.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7317300bf0f645f62dd7370b10ed3e49/87514456191.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/68672992405.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/qko55uhid4udcjga37qsv27bv2/93992966068.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bl31na5qkc59v7f7jrndgbaqg3/29552245445.pdf
    • https://moscowfashion.net/content/xuploadimages/file/tigemedudo.pdf
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/betus.pdf
    • http://montaze.org/democms/userfiles/file/suzud.pdf
    • http://fxmeat.com/upload/file/38c362521dae3073b49ab074110772a4.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b8e639bf8---16464759296.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df70f510a7---kabufazatezojokerexonipop.pdf
    • http://htwy.com/upload/file/68693680703.pdf
    • https://pointvirgule.ca/upload/editor/file/6763576211.pdf
    • http://onlinevay.com/upload/files/jokemu.pdf
    • http://ed-web.cz/userfilesfile/wiloxulopu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ice+wedging+is+an+example+of+which+type+of+weathering
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002424a.bin
af1eb5836f216db8deecad190b01f330121d30d35b2b08eeafa2bf767b5a002f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2424A 2892 bytes
font_01_sfnt_off00024dfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24DFB 16792 bytes
font_02_sfnt_off0002660d.bin
b0df4e52901628dcb1259fb4dd74272c61d8e2105cc4db2c0e92d83ae4e34eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2660D 21152 bytes
font_03_sfnt_off00029cb4.bin
1462891f36e1d8b7b2592f6ab4f4f6f41f9c6f51f196e91f16da914bc108544f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29CB4 11320 bytes
font_04_sfnt_off0002b6fc.bin
7a748505eae714563395887fccaff43b14ec03959a86b335d5bb6e2731087b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6FC 16516 bytes

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