Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a8ce7bb3232029…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 06:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d112fb4acfa7f51d7a1bd511260f6a37 SHA-1: 039c525b2be3613a04f6ec1e35c6e266c86596d3 SHA-256: 74a8ce7bb32320298139e6ad7bcfe413d88be4fcc07402825443fc9165a85bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=change+pdf+author+mac PDF link annotation
    • http://itena.si/uporabnik/file/mevufut.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/worixasaxetixolafafopodi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/81131155043.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d4a8871d---26595946503.pdfIn PDF document text
    • http://scantech3d.com/files/posasigimowixot.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/78420942364.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/lenusevupo.pdfIn PDF document text
    • http://findusafranchise.com/files/files/ziwajevusapub.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036c1418345---vuvoxirewezoxivuzisomu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zowomegixoneganaxagow.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pugaburuluwovogim.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29363617e---teditavedumuwirebujogaxud.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/65400007209.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4282c76ad---89719181615.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/romorimavivulefezoroz.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/32228531968.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/benuxodetevofaminawif.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/87837e8940e0edde52bce8394866a45e/16569841319.pdfIn PDF document text
    • https://dhesient.com/media/sivojomik.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/64422221830.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/58781236366.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/xaditubamele.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10892 bytes
SHA-256: 2e9ba01432a0c5ddb50189e7b1eba64e878cfd642f1dd8ca5cba39229c227948
font_02_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 17864 bytes
SHA-256: a3d5eb1ed810e3d3dbd99fc86f4d42c0a7d856595f4a8475241988202ca268f8