Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5f20611a4121c7…

MALICIOUS

PDF

103.7 KB Created: 2021-08-18 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e46e86080949a310c85604055a3b6ad SHA-1: 5166a054bafc79547d1d1e5b3df1a97a48f4ac8f SHA-256: 2c5f20611a4121c758edc7b80a388d568bd327e14daacaad3b2669d8581ad698
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://trendybiz.in/usersfiles/file/80805686774.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bbe2613b724b1be073378587d8e5304f/593586593.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/18c706c7ca269619ede0f887e1e1e50d/fawowotol.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wurilijegesaxovafupa.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/84822364248.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bg7qsfn45fs4tk924tgm3lkmn1/fowiduziwuxepuba.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2161aa70b---zuzesujabixesefewokuw.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ed1bec99b8c723dda62f9184a781e17c/baburoginurelajivegofelel.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/4537215137.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/29860138535.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/zosubaginetusesuromolaz.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7ff193b30e1573c5c04fd63f0385b261/sesovevufawivolunet.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c861c7f7f9---24868808570.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/nebudotipibisufarajemun.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zavugudaritosif.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/kolaku.pdfIn PDF document text
    • https://isosklo.cz/uploads/foriwavanasuwadikati.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a370f1982da---lilawamuvoraxit.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/gapodutebefamimez.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f9bcf182---5613801044.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/66230694722.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/81984281410.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/kikatetuv.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/zedigekotoxurowom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=novel+sky+president+substitute+wifePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 10904 bytes
SHA-256: 225e10c7cdc6619c2cf0073bc854c76e748ddfe81494cd782e7000034f0f6ffb
font_01_sfnt_off00014b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636F 16624 bytes
SHA-256: 7f625e218bda459dd9d3091abca129b228823dc2d34683756987f4ec9a56f873