Malicious PDF — malware analysis report

Static analysis result for SHA-256 609e846960eb5791…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b837f790351c58a42b969ed94de9f00e SHA-1: f752371af6ebed9c324e908a8f497d52e193da0a SHA-256: 609e846960eb5791607bf1f4b9de821622464ba7b3f9bd8fd119c9e3895a26d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=best+app+for+downloading+series PDF link annotation
    • https://inprovitargentina.com/ckfinder/userfiles/files/86219505791.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/26079684711.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jaxafigabe.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e2706ee3---selasubomotatosazojiz.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/92749834255.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/83143660153.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/rojipagad.pdfIn PDF document text
    • https://siroyensao.com/upload/files/terejo.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/66792728695.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a008616d45e78ac805bf80f04dc88803/60454517628.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/siwinujasurupevegu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614143f7068e2---46317735413.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xizepogolijuba.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d71fdc5c906388a281d85d083464386b.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/479347306.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/fepuvagogaj.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/pedesos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b12dc0a69---9832139492.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wopujazobutesopaweralix.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339f8d87ae9---kepokirejezowubexi.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/lovakafodelar.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/36988781002.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/bapevijuvix.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/mebaxitesaninumalegizudib.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/julasajamowukewe.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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 18796 bytes
SHA-256: 8a058c7cdc7244ef789bf9eb99c734cb0871bb5c1cb84251197fb24320695654
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 10812 bytes
SHA-256: 917953ff3a656398bb2b5ef1b15b2f7c243ca76b7361bdbc8da4d993b15f7e3b
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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