Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91605f2c6f272a2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 06:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 020db26c0bf4ffb0512be8feedb76d1f SHA-1: 70f724f2c2c52c1c92afc3b276b612dbdd374319 SHA-256: d91605f2c6f272a2b1d2f5496e9673af41493664454d099d4abea20d555fa68d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to click on these links, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pointwebhost.com/calisma2/files/uploads/bukagugim.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/kemimune.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zalok.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/bedudipowakopoguvabuton.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612506d6c6b0b---vuwugerinuruzitatapobak.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0d84cb1f556a19f8f667440609991775/wopunoberuz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f83407cb05f72be45fe0e2e24a7a0f18/pixurejobofiteze.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/52257025191.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/003e53eed4d4f98c3064b112bf126f09/56626892543.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/edf9fe77b6d34a31ee4327f1cf725e68/puwurid.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/28630682366.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630339040.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3fbd3b9---12735917983.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xezovidibiboloranuxozudub.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/33309591775.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/8514427011.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6f9910b4---boruj.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/lefawogaliba.pdfIn PDF document text
    • https://123natura.com/stockages/files/sejivesetivi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/21763f506b297b4b655fd6ce3da810ea/zuxesaxeluxudu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/33f0b6eaf553b3c7cf034224888e65bb/nelesakoru.pdfIn PDF document text
    • https://medtek.vn/storage/file/bugidaxubopasur.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b7b995be6b2232cf3085f1595d6864e4/82775895246.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/84173163948.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/37097363984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=visit+report+financial+institution+other+than+bank+hsc+project+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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 19644 bytes
SHA-256: 275b3fd9d492e3fc986456caa9c08c4ceaf69b8f4916f046a2978458fbedb5cd
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 11148 bytes
SHA-256: 40c06ed1966e6132ae211fddcfea39c741343141943aa0ac385fcded30bfbe62

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