Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb22e1d561ee468…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 22:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f840ab8d1e467b76be4eaeaa52fc0b2 SHA-1: 698b07795c8a185208a4c5796677280d09606f59 SHA-256: dcb22e1d561ee468e839fcce141fb3d151c77b7d64d3440d414af1e5324062dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install a remote support tool, a common tactic for gaining unauthorized access. The presence of numerous external URIs, some pointing to compromised websites or link farms, suggests the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drafthe.ru/uplcv?utm_term=how+to+control+your+pc+using+android+phone PDF link annotation
    • http://thestarbusan.com/FileData/ckfinder/files/20210901_CBF3BB20F535D973.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/laned.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631212445.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xizevu.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/61969299854.pdfIn PDF document text
    • https://hoalavender.net/upload/files/96911344164.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/t61jrc976ruhe3nph9lhcbd1jn/9021985772.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/14765058554.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/42862720192.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/jilubotenoporekupunepofu.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/67719190906.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/22280960466.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/ronuf.pdfIn PDF document text
    • https://felicityokolo.com/file/2314624654.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/gagugopitadixaropapufat.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f448130b1---jisefosoxigeluze.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16133a885d0d8e---ligut.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/7576424048.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/80426646835.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/23986756383.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c10ba3ff2---mekasizese.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee43e5510f---renogovikosuwawolub.pdfIn PDF document text
    • https://ever-progress.com/upload/files/busurewumiwosa.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/tosimos.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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 17672 bytes
SHA-256: 8244e11afa5831e3be35cd472dd6ea7fd65246c5ffd75ef9e21c602b029cb130
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 11084 bytes
SHA-256: 7381a7f6a03cd23007fd4deaff54d68fc5a4623c12f2ace3ee3f3cebdbaa967f

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