Malicious PDF — malware analysis report

Static analysis result for SHA-256 461a82f0ea8ad6df…

MALICIOUS

PDF

82.5 KB Created: 2021-08-17 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b2b170b94fcd972df6c75a16ed2c40e SHA-1: 281b0b96e7be68e44577f1ef2d4ce85396878680 SHA-256: 461a82f0ea8ad6df142d26d8c5eeee383274f0e7f562d2a8ba02f3901597cc74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload storage or disposable hosting, suggesting a link farm or redirection mechanism. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://allytemp.ru/uplcv?utm_term=como+calcular+corrente+alternada PDF link annotation
    • http://portalcom-b2b.es/img/user///file/_0020720001619806878.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kolaxa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/15b4dc1d4a7c8c0ca5b16ae79a5b0dd8/kepetepipikojedutuwivev.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/luviwiwagugoti.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/66430203818.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9571adaf---43190592228.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/vubibokarukiso.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/3794403900.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/16878980353.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wokavebakur.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/40710576462.pdfIn PDF document text
    • https://banghenails.com/upload/file/kagekesavebaz.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/20669407579.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608554c763679---nosulosaguledojeror.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/sagavusedilan.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/36393183553.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4af16af3e9---lejipizanewakajatiziripiw.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/63806849453.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3be102939---dasofom.pdfIn PDF document text
    • http://retailcop.ca/files/wuduxesivemogemuretuzod.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/pawugenewosadobudorazu.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1cc4e99553060b1a61fa4fa5b6f99a23/niropik.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/8664307070.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607092cf30dba---14079117638.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110bf64b3cf8---tuvaboxewopotulutu.pdfIn PDF document text
    • 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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10404 bytes
SHA-256: d3cf870ffdc24a4004f1bd6399e6a569f4f109d757bffd7115932ff190d004c4
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 20316 bytes
SHA-256: 87053321187d7348ea508e1a6ba6c754b147faec7363d0e7239128dece31f2c7
font_02_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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