Malicious PDF — malware analysis report

Static analysis result for SHA-256 c704de8467478d81…

MALICIOUS

PDF

81.7 KB Created: 2021-08-19 15:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cadceea32f04e1f0163a83ac2a1ae9e SHA-1: 88f3150ef08489d5cf32479467534aa0176b65de SHA-256: c704de8467478d81af41c74c6a10223066886454f59b1c9e601cd0bf02c2ee9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://confetti-seasons.ru/upload/files/40352832633.pdf
    • http://bebelino.ru/userfiles/file/xidigolidenakotam.pdf
    • http://mebizstekla.ru/userfiles/file/xuvab.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02b1e7b30---83487780125.pdf
    • https://rosettes.it/userfiles/file/81109637251.pdf
    • https://kingcarmotorista.net/uploads/files/xulibatodupoxevipag.pdf
    • https://imaggu.com/ci/userfiles/files/luvaregudawosa.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/41239792004.pdf
    • http://virus-safe-zone.com/ckupload/files/wafubelamagatiginatijuda.pdf
    • http://buergerforum-tirol.at/file/lejina.pdf
    • http://violetstudio.in/userfiles/file/vugig.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/wogewumadoxudusujami.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b5cc339c1fa490e4916df1886dc2fc2e/646485744.pdf
    • http://kamerton.nl/clientfiles/potubaxijiwovitosoragex.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bdbcbb36---fosijulibumuwofagumiwajik.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a3f8634a2---40192166923.pdf
    • http://srtprogetti.eu/userfiles/files/mulepudetikod.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862117c1dff---bazisutijefajuzolofor.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/335d1fa0b90ec6ddcafa97f60f558d51/jozini.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb6644c3e---14085243808.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/jolenilala.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610767b82b45c---xijobevegoj.pdf
    • http://www.awakohchang.com/image/upload/File/owimo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=google+play+services+app+download+for+android+tv+apk
    • 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_off0000dcb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 16792 bytes
font_01_sfnt_off0000f4c8.bin
c6afab2b078d20204c3b276c3c67cf2017ed34c29f7408c837963f62f0201039
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16060 bytes
font_02_sfnt_off00011e3e.bin
41845b7ce25c17b742c7ea72dd296795dd7bb67b532a0465e622495248fbac6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 11192 bytes