Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1d9ac87a375bd3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 00:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1480e87a637380b17912c9bc5f6ab9e9 SHA-1: a57a22824730dd49f32a88713d705a884bcb0e2f SHA-256: cb1d9ac87a375bd3709af4398e2e4ad1e4d700c43a59055be104b3b5b4bd46a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The presence of a QR code lure heuristic further suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=generate+qr+code+using+zxing+android PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161321312295c0---87339965310.pdfIn PDF document text
    • http://spiregene.com/image/files/20210920_105621.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/39781308401.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/mawerowexowulasutemoremif.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109130954285347.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/15715501434.pdfIn PDF document text
    • https://yifff.se/userfiles/file/jusadunobirow.pdfIn PDF document text
    • https://panoramabyty.cz/content/boluxikoziwitatafoxi.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/47167571382.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/madasifeju.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/53741492021.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/24995288115.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d42cf711b8096912429e1a0f2b73f3f4/97707103177.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131160b3730b---bebaneboxasuko.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/lotaj.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/90649614930.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614330383fc7d---fekifadepasimeve.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/tuvokig.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/bilix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131263beefb3---kixej.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/39455399918.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/vajewusexexopatupojifetox.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/25456527233.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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 17740 bytes
SHA-256: 23c78800fff6270dfe385a01363ff17fc4d87a68df50a3970e9289d23f20a98a
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10948 bytes
SHA-256: 071e7d9eb9e64e47a6cc8be5b7260897e8b941bdbe6b84cb23df55b05c81b8d0
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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