Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a24bf3f31d8319…

MALICIOUS

PDF

93.9 KB Created: 2021-08-23 13:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3315245e65bd14873844cd5c5feeeae7 SHA-1: 115ff85c46795e14a0600f3164608ec770d4d074 SHA-256: 74a24bf3f31d8319cffc7ff5372c5af47e6cd94c9551efaae255456f82208652
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5c0b3aad---xuxogenin.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/pseo6uqogfs1r3cirbadsd1p82/nurusod.pdf
    • http://champaigncursillo.com/userfiles/file/zofitolulefe.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/04b8611769d68e52a2074ef7b926feeb/jesujarajefofabojafuf.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/senekugejigedomogopefeti.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/savifoziw.pdf
    • http://mdsalon.ru/img/lib/file/88230615588.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16111ae5054bad---tefitewupopasadawopusapo.pdf
    • http://sjar-tech.com/uploadfile/file///2021071303484846.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/wazatilunirunujuziguvi.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0g6qn3a3o553vsog8cnml9s8db/lubaterikiv.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/75739502860.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66e31c6a2---wesevurigaxupiwu.pdf
    • http://akwarella.pl/user_uploads/file/xatije.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88d76b013---fekafenulevoselivuwuja.pdf
    • http://biocoop.legreniervert.fr/ckfinder/userfiles/files/99647850556.pdf
    • https://hockeymro.ca/docs/file/66080635953.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/54f8612c3d50f77bfc71364254dc6a86/xilexo.pdf
    • http://posekatzahradu.cz/files/file/23145245869.pdf
    • https://caribemed.com/userfiles/file/rademapamuvuxige.pdf
    • http://datavincity.com/uploads/ckfinder/files/64621820533.pdf
    • https://avgdesign.com/userfiles/file/bimafikagota.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/12rnkhgjbmk8sg6npr6niuusmp/75256920355.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/12057755022.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/15f0f709575723cdd94fabe1de63d16d/94045728117.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sapiens+a+brief+history+of+humankind+ebook+free+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_off00010964.bin
bfa5cf37fb229d21cecf2291772f3cb9bac5b320ed0f67f6883160a6436c80d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 11372 bytes
font_01_sfnt_off000123ce.bin
93645302dbe523485a44cc34bf2a5f7ff2531a08f7e769188285b83634c566da
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 17164 bytes
font_02_sfnt_off000150a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150A9 16792 bytes