Malicious PDF — malware analysis report

Static analysis result for SHA-256 352d2091da2113c5…

MALICIOUS

PDF

94.0 KB Created: 2021-07-14 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb8dc73090824e625fad0b285c5641be SHA-1: 47fb29d24446e41e0998b6ad2414bdf2418e04f7 SHA-256: 352d2091da2113c5d2a4d3994f55fbda1a4e31319e684efcc8b655bde5de4933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=ever+growing+list PDF link annotation
    • http://geodez.com/pliki/file/73225649875.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/baxavorotuvi.pdfIn PDF document text
    • https://educhina.mn/editor/files/36646796406.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210624041205.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/davusefesofupedu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q5791tbil4pc7cntj6tnpk53r8/93194330833.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5922272c726ee2751ec9716851e02af8/kowosuzivabutafamamox.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7bbf6223d5b7fd54affac836fddbf5b/jabinadikikesubugulojaj.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2p3cf4lrr2q0dtsg2allladspu/kewimapatikelidifot.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/31243673120.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/84322018104.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/kokufubenoj.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f5094e1cac69a5f493eac3fcf4c0dea4/korupubemiban.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e57596c962d---28466641853.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/15765302619.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfae178208---27635278657.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f7287d6991af69e82dd71baa59b7d39e/32106958164.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/66105670570.pdfIn PDF document text
    • https://tonitomov.com/picture/file/fegokotorizoruxomatoretu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/wejowinuzagimise.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/59554907709.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/85647593362.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_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 17308 bytes
SHA-256: 3c17dc6c5889a315d4d925fd2263ebdc467a65858548f585beeebf086c0b2d4f
font_01_sfnt_off00013bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 10256 bytes
SHA-256: 9fa02c027907020216d6e43bfd3aaec8c3a35ec159e7dc29bbb88eb2a6d2a786
font_02_sfnt_off00015311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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