Malicious PDF — malware analysis report

Static analysis result for SHA-256 907915c31192d034…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 04:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0e211d7bdd27f21b58775a437dd7615 SHA-1: a8d86357b49a8c351849a8fe7c4caf78af23f62d SHA-256: 907915c31192d034f60333d659bf02f378296c94875ad5445b5f0fd0d8996daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential theft or further malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=clumsy+ninja+mod+apk+unlimited+gems+and+coins PDF link annotation
    • http://marisqueandopremios.com/campannas/file/zasefaruwadaxa.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/954c73515a463545bf4a01fa55e4e242/visab.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/jegekejodanelupi.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/lovoxebilavedepog.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/garemiravexa.pdfIn PDF document text
    • https://coil.hk/upload/files/wurekesikel.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130939483020---87411205956.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/6751412752.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/pawugozofetabutokep.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/tesovuwitadino.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/jivakititizivapew.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130be919e874---59878090996.pdfIn PDF document text
    • https://digireg.sk/upload/4380486286.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/37129137411.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/64158149287.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lenega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613148d89023d---91132155440.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/51075747821.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/45946995965.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/1821714fab6f602a3c400f4793f6e437.pdfIn PDF document text
    • https://tebra.si/userfiles/file/94933575316.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/zixilopodonadegi.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/88785239786.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_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 11224 bytes
SHA-256: ca9d5ec690c5e62c712b87de9b0b68625f65eab42b41b6cb31d6a8937540e0b7
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 17332 bytes
SHA-256: 32ba6585edc124e5ec26bba3990461b32a84778f3876ef57f67db57d7de016bf

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