Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b81499afe2ee584…

MALICIOUS

PDF

99.9 KB Created: 2021-07-15 09:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34df49f9e335dcc623a8224368c41f83 SHA-1: a8e07203005073b0748bd6329363646e6bc88bce SHA-256: 5b81499afe2ee584560b64312da7ef5e3c7a072082b01e164e384c0f3416ea7f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f61bc114---jogunuvu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fkj2rn2ksvdfg3o6lj5kkq4ue6/wedipugixom.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/walesaresodutivin.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d471020deaa---24385641388.pdf
    • http://accessiblevehicleservices.com/userfiles/file/jigeledofukexuzenur.pdf
    • https://hosvagyok.hu/userfiles/file/52405397898.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0ec99d9a3448ba79f6bd0d34c12141bf/74491825225.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb40b8e868---kuvupegako.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6568e68c3a2887882278343c61dcbe0c/lagote.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36e694672---gifefazumatogo.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6135946ca445c68f1ffea73538addd52/62398875418.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9180edda---kivinotituwuvosagi.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f50657b48139d512aacadc8817e127e3/negoxinivuvawipite.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9a47e29c4ce82867f0de83717c3835ee/49720880093.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608666c2bf95a---96561412237.pdf
    • http://soleilboo.com/images/uploads/files/zekidukiruruzubebenuzigeb.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160807b44589b4---pegitovudola.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefb8cbe09---4190579599.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/zazojonixopiwajutugimo.pdf
    • http://generaltubi.com/container/ckfiles/files/bisakirisavokusif.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c43370ab---53781727287.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/33128487239.pdf
    • http://ngocvietbungalow.com/upload/files/gapavuxawutejat.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e539ac3703---21403032963.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=an+insider%27s+view+of+mormon+origins
    • 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_off000125d3.bin
2d71c49d6e319731dff6278bbb6399d6963c1818c0892f4c3c30885738c093c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 10560 bytes
font_01_sfnt_off00013dbd.bin
c8d28968632435e4351fa95ca49703ee544ed02c09815a553076940ed3aff197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 16900 bytes
font_02_sfnt_off000169f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169F2 16792 bytes

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