Malicious PDF — malware analysis report

Static analysis result for SHA-256 16296f60d1b8b416…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 15:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04c0144f37ad7da0ba5ee579734939df SHA-1: 78887a6829fd457dc5a275d896805b52c5d204ee SHA-256: 16296f60d1b8b416391a12f816c2e7493d7f7bb4c662495eb947956658b5e6aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=top+paid+games+for+android+free+download PDF link annotation
    • http://architettomontanino.eu/userfiles/files/32873835179.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/dulezolagutak.pdfIn PDF document text
    • http://farashimirooz.com/files/fewomasusidefivi.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekupezetorepimugamu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/62583152214.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/sefodijadeniko.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/85758322977.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/niwurofufomumok.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613de945c55e1---26981723485.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/nopejurapome.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccc051149---famaluwuzenedufix.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/fonesubuvudawe.pdfIn PDF document text
    • https://fasleh.net/Files/files/wabifatagufanat.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/surelivisuvuk.pdfIn PDF document text
    • http://parateam.cz/file/83047152368.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/817e8b50dad9f723a42f4e9ec73c61e7.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613548ce1191e---59233642014.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/fotosutidasimatuni.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901232110.pdfIn PDF document text
    • http://canoeing.by/pics/files/lovetoxavimibinapobotul.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/51308779654.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/96772836031.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 14848 bytes
SHA-256: 52cba2577de0bd7b6d5b4874af20c77f39f186b5c5ad9910a5d70b1ad345e065
font_02_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10792 bytes
SHA-256: 278bb909cf196cfe75208138c58b126dd922ce75c5ee39a36cd845d7aaead7d9