Malicious PDF — malware analysis report

Static analysis result for SHA-256 448dc6b84596beec…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 06:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f9f529ce996683776b9ee916eff159a SHA-1: 8dad46a72b1df04c9045f87248d6234684675791 SHA-256: 448dc6b84596beec7dcda1528dcfc40ca3dcaca28b346183488355f770a90db1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads, suggesting an attempt to host or distribute malicious content. The PDF structure and embedded URLs are consistent with phishing or SEO spam tactics.

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://cructi.ru/uplcv?utm_term=pokemon+platinum+ds+cheats PDF link annotation
    • http://chokmanee.com/userfiles/file/jefaz.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/52038114468.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/duwuwulexozabegu.pdfIn PDF document text
    • http://melabo.com/upload/files/67727530602.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139578e0e433---jerabotivumolidorew.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97561370633.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/bugusarixewekepifatob.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/90897746686.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/97563472028.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/vuzupofig.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0843f5753df0c35067de75837fafdca/44816594564.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/81481646561.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/fuzere.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/74874661591.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/77078067061.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/perilevuko.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/99212479900.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/ginobodubuxasakufune.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8d0ee780---sajojasixunanutoledekape.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/60091309073.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/lajofojogupafitajojo.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/14658079041.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/21066125505.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/94785889572.pdfIn PDF document text
    • https://jetaime-shop.com/files/dovotamipilog.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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10872 bytes
SHA-256: 5b176f34add35618e0070bd9e15f0cc77e2244732885d3076399a5bf8c472efc
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 17332 bytes
SHA-256: 623a78cef411a6a5649abb2244de6afe6388e40f41501df61338d8fb7a284cfe
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1