Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe29f5de4d1fef69…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 14:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 530def6abf92fe586628a51bfe2b2c61 SHA-1: 8ddc90c62eec12a52588415e4af79498b870ebe4 SHA-256: fe29f5de4d1fef695ab7883c4ed072331cf4d75705ab1d5c6be259d61a0a3fef
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely serve as lures to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://guclupin.com/calisma2/files/uploads/linomuvikiboxisilusa.pdf In PDF document text
    • https://bititechnika.com/uploads/file/48991916852.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/81684900403.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/84579917076.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108281051447229.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/37807879895.pdfIn PDF document text
    • http://iwort.de/userfiles/file/wabine.pdfIn PDF document text
    • https://mmszke.hu/files/file/52777463910.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6b4a2337c9c96b3b1013e13683163cbb/45656057905.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/duzum.pdfIn PDF document text
    • https://esvigo.com/upload/files/30262795179.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cab9a593ea---wufarawizutoli.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/gesuzo.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/guvizojezogaxufavetofu.pdfIn PDF document text
    • https://angkalaris.com/contents//files/xonutosuted.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/29651224252.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6rqar3o15820s5k0aq5ho7ti99/welobixizujukep.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6fac82821a9a71d4f9b21ad6b3462e81/ginusawaxo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28bb6104b---83672502608.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/jizug.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/kivikarofubitewotefibuzi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/48361722122.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070146344aba---gumevapeluf.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/16715213486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=class+11+science+book+ncert+pdfPDF 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_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 17192 bytes
SHA-256: 1b22aa613478657e6eb53eb9a51542cd007b5f910d33806d7c0ec87b05002f36
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 10928 bytes
SHA-256: a0bf293ff8bb3e36439d302dc842b13c42ac76cf9ed84dced472ecf2cc999901
font_02_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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