Malicious PDF — malware analysis report

Static analysis result for SHA-256 70987992403bbe93…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53b0a5669a3663c98a2389695e154483 SHA-1: c42aa271f6e489c9f8e899f4f570ee772d1a7b87 SHA-256: 70987992403bbe931de7f1c66d213cdc80ebc155db8ebe2a6b0ba83448e95e5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick the user into clicking these links, likely for phishing or to download a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://philabc.ru/uplcv?utm_term=mesny+calderas+de+vapor+pdf PDF link annotation
    • https://turdv.ru/SITE/files/editor/file/zeserupu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/158aabap03d86ejamck033o3fu/gidubigorigedetub.pdfIn PDF document text
    • https://85097781.com/upload/files/52816754455.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dadb402f0---64716310801.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3a299d4052c67aba39fac36edb9438a8/11569291728.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/pegisatarerolujemusitita.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fff432220---49755283021.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/443e5a231829e9cf03c369d81ee2b722/81139240818.pdfIn PDF document text
    • http://yongchengtech.com/uploads//files/202108120342288051.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f167b3635c---62339445929.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bgcdv0ki6lrklm318gf00impc0/vubagisewime.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/dipafapadivazotupunufat.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/jipel.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/58771555927.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731c376d95e---nisigawixomoki.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/708a166df3b83017848ebb21526dd2ce/semeravutuzames.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5466de3263---48030675690.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/34572411947.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/42443522303.pdfIn PDF document text
    • http://koronowskasm.pl/file/61156618736.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266862aa40---dojikufuvare.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7dc0425da---40868173786.pdfIn PDF document text
    • https://songhong.info/userfiles/file/68349200437.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/53920473192.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 18648 bytes
SHA-256: 1934d6e6ea0a3ccc1ffa2c449b4240c90d746c3ef2e24b237e2ea55e2526b92c
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10596 bytes
SHA-256: 5b270a26ad53c3de16fc39d7ca3e7596d548d63e23c23ab8bf4e5e32933b7da8

Open this report in the interactive analyzer, or submit your own file for analysis.