Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd7226248e1f268…

MALICIOUS

PDF

135.3 KB Created: 2021-06-24 05:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 46bfe1da3fd5a80320704807b99d48fe SHA-1: bc837a25ebfe99dab140d9b68e0ea4d09198867a SHA-256: 1bd7226248e1f26857dd67987e1f51adb636cb94913a34757b69075cb8565a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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 http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/m67estcu3h6gf5gshqr1tvclog/29137099221.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/81026c8842a553d07dc459246b36bedc/feliwumadixodejufozumod.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/23310526958.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/79d83d8dc626f6af803f13d4540cbeb0/fuborudunibewep.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d8e94f63692a02794a8c61a508c129d2/78289357206.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/20b21d3a7f526619dcc395c3706d4e78/mofajokabub.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7fjgutct0c41vmrpiph7fifu7o/tezadateg.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086ceb598d5f---62161675495.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607320b65c66f---34739839827.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6cff39686ab5d53d5eae5863251ee6bb/semuv.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/83732845175.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/40916985922.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098345cb6b29---39338066145.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/2544884929.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080aafd268b1---migunivipofimej.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/48452183663.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=durga+suktam+kannada+pdfPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018bec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18BEC 6820 bytes
SHA-256: 8753b8eb6b23999714c6939ce66b8baf738d272cff0e980f8f553fd7ed643f88
font_00_sfnt_off00016e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E02 5392 bytes
SHA-256: 2d2b3a54489120100d92e65dc9e1661042f9f594776e95faf3affec7933766d5
font_01_sfnt_off0001804a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1804A 3772 bytes
SHA-256: b9b49a3c453c53986d7a61d4291ac5a87065d82ff96be43ef0dca6427e6dc540
font_03_sfnt_off0001a163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A163 4164 bytes
SHA-256: 33dfdebf6ea1c8c1566c8c82bcb9440940d9cea915c246a19fd940b2d8e067d1
font_04_sfnt_off0001b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B11D 12820 bytes
SHA-256: b5f93954ab0bbb5947fdcf317ad1975cc3b029bc94b004360d7bc15511035dfa
font_05_sfnt_off0001d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9E1 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_06_sfnt_off0001ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF32 9408 bytes
SHA-256: c4d7e22344f1a60f6e24f1db5be34270302f162eecffe16a9cf71b79eb14f70f

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