Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad5ed1a9e7ded48…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b7a76c9232b7aa10a6068375236593f SHA-1: 5da96728a82557d1785d53ff29fd8f0b1761e8c7 SHA-256: 5ad5ed1a9e7ded48e0ad6e15d0d3c8ca7354638a2e65f3b021f8b533f90298ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://az-volnycas.cz/volnycas/fckphotos/file/fanegurebibavevigur.pdf In PDF document text
    • https://careersourcechipola.com/files/public/jidevetesazikivimeligo.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/kibofefateredatubirapo.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/63791208591.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pulerozib.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/73d6a1b84864f30022604c400ece8ab3/10752809282.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161494d0482891---38442676460.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/50192139100.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/14674489518.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/4835272600.pdfIn PDF document text
    • http://offerparts.com/upload/files/95197808753.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/tegusumenovivum.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6223e4b04---kiwalojirerizipul.pdfIn PDF document text
    • http://e-menu.hu/editor_up/zubuselutamumogine.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/debakaziwazexolulirole.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614773aa096ce---sulatefakitumema.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/90193119185.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89910130224.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/velikokob.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/wedifepogizesijinorepa.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/86670085053.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/dumudebivapizafod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=game+mmorpg+androidPDF 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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10460 bytes
SHA-256: 2c9c16676707119ec465b9b6ff84ffbe9575fecc5423cfd33b78453dc6eb2e97
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16400 bytes
SHA-256: b7d99844a1a3a291bc249e2222a9f8238ae11d1157ac3b132e95ef7c7f2b1b17
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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