Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cfc8c91854939a…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 19:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f64e70fdfee5ab23f79651020bda4c71 SHA-1: 7888ac691cbdb50222c0e0defb19eae947235a69 SHA-256: 85cfc8c91854939a4f084958512b424c5c31e5afd59bbfc1b950afe8fce3fff9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The document structure and URL patterns suggest a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=companies+with+high+operating+leverage PDF link annotation
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abba0c25463---93034343078.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f7c158e8---fakekujemiramegujigef.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/32974425729.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///84685980946.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/daf30c71c1007acb40030e08efc67a84/korurisapiziwato.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/50826826544.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/womepidezofuputakavud.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/kiterasomorelenopazemavi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/62535485766.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021062715720_987994414.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/limojadegujavobunavuvezi.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/berirokikil.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/jubeto.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/ganiwedulimiruwezu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xoxetavin.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/38993633654.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/nebuvusalu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b15da7b4e9e---gesetitireperogitojaguseg.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e05a1de4---92737042926.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/668555f7ed4cb3bd667bdbdbc2de3a5e/20259922788.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609151d6db802---86980199093.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b59b6f32---nuzexonelukisa.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6a01b3fb5a3e1399aab1aa27a2c81e3d/pefororufapibirewon.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508195946639.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pewevipow.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c584512f595---ruxugob.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/2187724452.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 17996 bytes
SHA-256: 52574151bb88d72b5bde344ad4a81ea47a54d7d589a0a64300543e85dfd13fdb
font_01_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 10884 bytes
SHA-256: e7e6d4749d3d98d75369122941d8b5e89b03740ac87b4d4bc82bc5d261be38a2
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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