Malicious PDF — malware analysis report

Static analysis result for SHA-256 58927e943de26b26…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 10:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a738cfd9f1e28ac3c9d956a3d48b44c8 SHA-1: 823ea720c1efaaeca7937dbc93e7e1559b6c42b9 SHA-256: 58927e943de26b26a16912fad5c983e48ebdd8faf263bf2865d5f43c5cec4cb8
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 compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates tracking for marketing or malicious campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content, likely masquerading as a software download.

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://ketchas.ru/uplcv?utm_term=adobe+after+effects+pro+apk PDF link annotation
    • http://brukikostka.pl/uploads/page/file/30217462232.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/12800582267.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/levapelatezinudawumemiza.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33171529258.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210916_AD8159CBFCED0A86.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163a651b31---1098184739.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/rofuximaxutamonif.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0b74637ecd9ea75fd9612591a9f18a69/27588755922.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/lumej.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/30195272829.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/beripiveja.pdfIn PDF document text
    • https://la-klamm.org/Files/files/lukapulovaziwovexaxatosa.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc65cd120---litumuribivubolowiluvo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133182ba5b8d---momawumakuxeb.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/zewifufera.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28532127283.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/vegomubavota.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/fasepu.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/lovajisejinegadifati.pdfIn PDF document text
    • http://roocenter.ru/upload/file/99571329963.pdfIn PDF document text
    • https://nyig.com/files/file/19459397497.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/44738345286.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/figerok.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/renedalatemiz.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_off0000c283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 17276 bytes
SHA-256: a811948fc65e2e4527a005061d23dd8364c3aec3c34a0ca139fa49caadc4029c
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 10584 bytes
SHA-256: e3043ae89c28a473610e9f9733ee96626ffd6f4979846948328f98280b7b5759

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