Malicious PDF — malware analysis report

Static analysis result for SHA-256 a437db15b8fa3caa…

MALICIOUS

PDF

75.2 KB Created: 2021-08-17 19:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a97c06f08a02cab8749bd9a1fd4f5db7 SHA-1: 94f2997a1d04a681844900fb6867045cd3ba9199 SHA-256: a437db15b8fa3caa5f345d5f55fc11f20d26c24f8fae1443a242f1ed285e73e8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=34+proyectos+de+electronica+cekit+pdf PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ff82fc89---raturubulowepolerusos.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5379c37fea1f049506cd0122badc0628/54128385440.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/xudijimiraxe.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5367a70578---luzafojomoxiwejefinazuru.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/af5b4b264856d7019f79c52ad6962fc6/59789645078.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210730021851_w3wefo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/visovaxagapogufusuvek.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/30723105621.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/67b41c8674f3374a4740fb0ccc0443bc/93624531286.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/71029513633.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34abad5dd6---19098368599.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe62cfcc0---92809445177.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39975384587.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1baa9e457a---34924666028.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/ravoke.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b25818ea---ripetejafowiwegezulopomu.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37184505874.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/nimofaronupipopirilube.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/40534055922.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50b8f12a9---26214690337.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9789b8cb7a---8984313672.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/fuzikige.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_off0000c1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 16716 bytes
SHA-256: c6ca131b278af7404b3d2c052a1472c535a14669a294569a0f192181a3e75674
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10972 bytes
SHA-256: ccaede0fb312a256555e23f2d4ebf5de9b9fac9460b543f782c79cadcb69cf1b

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