Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56323fb0152cb96…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 13:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6b4c68003524f2361d1951a83746111 SHA-1: 3dd87dd441036abd5a39bccf14bc3f741965be3e SHA-256: c56323fb0152cb96768feeefe84d1f915d5d213ae770f30d5f26829f39e08d48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=watch+friends+the+reunion+123movies PDF link annotation
    • https://ccskin.com/geektic/files/dovapolewomemuki.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/fimajutazujejelet.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/2628637074.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/xirepomadugofesepazawur.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66665924630.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/91272311612.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466c3ec75d8---66157267692.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/26866304954.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bomadivijudexidi.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sawipow.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/18477944094.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/temevutamim.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff6f714a89e43e5a838b08c2c3b5804c/77847419748.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/17535119826.pdfIn PDF document text
    • http://kco.su/userfiles/file/lazug.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/54455081047.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/wutajaxitoxusof.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/66799711849.pdfIn PDF document text
    • http://maxbrio.kr/files/files/48648129531.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a7a60c11---26707108100.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630509267.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/32721242128.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_off0000b686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 11196 bytes
SHA-256: 79296ace105aa8b8362bd59d7bb53d676239897f439f81d55300ce968f6ef8ff
font_02_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 18152 bytes
SHA-256: 32dabc9eab9c7eeb22757cdc4ca290fc1b21d4534f4a3bc280fb8d250868a497