Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a6a6492cfc37af…

MALICIOUS

PDF

84.2 KB Created: 2021-07-30 22:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2441d0ef0793646c9542cbeaf4c0921f SHA-1: 3c7c336dae35a7da67349c385d884cf582589dbc SHA-256: 12a6a6492cfc37afff882abce73b9fdc050bb2154d7a0f183d59eb0dd014c2d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://esthebel.de/userfiles/file/wirufumepamagimujiti.pdf In PDF document text
    • http://patp1ryb.ru/media/file/39134304666.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a64b2fd09370077f9b6d1addb9ea61cb/mepugunuvavegegomenuti.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/44017870600.pdfIn PDF document text
    • https://schmitz.cz/res/file/pukadibotumatujaw.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/kebopipajitibejamelabax.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf7e3a043---zezeliwini.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/44299706135.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/lipigudirizemesur.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efd1304f7---2485303008.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/faniletidavudoso.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xenevejokomajumid.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/dijurek.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/pafamefasibovavalajijeke.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bc7fd8777---molijareniziwuzinaz.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a440869605d---27533377356.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf04e3afce---tiregivigulofezorogefer.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f5f9d561---87517892944.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcae11fe1e---26280299211.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/poxaxagilipakaso.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/43691817605.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9afd88f14---86464465851.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/gizowekux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lista+de+cotejo+para+evaluar+conducta+en+el+aulaPDF link annotation
    • 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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 10760 bytes
SHA-256: 9be56c5622e283033e611c599c66946d74a374a690aae70a580cdc5dba82fa11
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 17124 bytes
SHA-256: fa5ce137958437668f09124ca55cb006b14e29e4921b16390e952ca92ae50a29
font_02_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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