Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aefc7e8cfb9fb1f…

MALICIOUS

PDF

88.5 KB Created: 2021-07-25 08:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e8d6937ed2786c24486567785c019d26 SHA-1: aeb785fbe76e72b5aad2a0e14b42a37fdd5cf023 SHA-256: 4aefc7e8cfb9fb1fa95c67f1b810b6460bde42861a668e527d80553248bb096d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7aeb9501c4a9a87a7965b59dfa45e041/tezenifo.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816fb27b168---44780510298.pdfIn PDF document text
    • http://anpo.vn/upload/files/ritipekijefatepime.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0eb3cec2---71357144152.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3e62e184d3a4f5054bb2b1c35e547af1/wenuzoti.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/blsmi87lm0f49285qkednoi2na/tamemun.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1258937d3b---73014946665.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/6122021663.pdfIn PDF document text
    • http://nessium.net/userfiles/file/fikadizizeduzoj.pdfIn PDF document text
    • https://peterdegendt.be/file/genasokuvebug.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ddedf8b23ae2800790356b13c98b57cd/37885828611.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/dobojefebaguso.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/affeddaffe555472ed6a0333303b0f1a/77380492791.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/pm4t3b2bas2fteqrls2aqss340/jerubewasozapiwejukeduzi.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lemojunugelumitid.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc2ce6daf---5220931791.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/dubavikesubadujane.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/95141543162.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3403bf482---xomedugipox.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acf396dc0---gibixenenuvezu.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/59546157332.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea0dd08e94---puniv.pdfIn PDF document text
    • https://tavio.ru/files/file/nonovevak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=block+puzzle+games+onlinePDF 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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10824 bytes
SHA-256: 766934e69940cc049fa48b3856d8c4ef5d06dda6d2972ed28da44905071dd2ac
font_01_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 17072 bytes
SHA-256: e85aaaca53614d15b6dafdbb0424d8c22bba1fa40e08561a26acbab5624f7ccb
font_02_sfnt_off00013bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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