Malicious PDF — malware analysis report

Static analysis result for SHA-256 262174c7912d7d5c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 18:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 552bb357632a84a93bb916ce90a8d2ce SHA-1: 9499a51514768377ff99ea0f630ddacaa781d060 SHA-256: 262174c7912d7d5c5978fe8a10da9642a386cd6de5f25435f12a7b461017c8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16221100502802.pdf In PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/teguwikovozekuvodu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863545624f5---65658420008.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/pelofak.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///93556164794.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be85b6280c8---25744289341.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d04889ae7f038938e4c3f86fad1c1bfb/retafivofoluv.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bc529c3a2eca618423daf5cb8c588268/34460367529.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bjcps4hg0lm7ip0kv0gln28aa2/fedob.pdfIn PDF document text
    • http://kleiberit.ru/files/file/ziwov.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/50828370727.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/55914519849.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9721939e2---mozew.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48e41f40c---dalulawi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/kolirovesavi.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/torizevibusirepozadufafi.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/ketefexuxezalesukuzib.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608728b5c429e---12130922099.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/77028195362.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fqk02b6uiechaongebitfv65g0/detowusiruka.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853f04ef9d6---bafuvexenunotav.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6b616467b036d4bde071cbea8b5d653f/xazirezakasizuje.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/meniwoz.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/68407165709.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/sezub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jet+propulsion+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://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_off0000be5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16276 bytes
SHA-256: 7bd85a113115f2a12ba7f89ad1f095e5ee824ca131b39bfccb24e619591b4907
font_02_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10420 bytes
SHA-256: 8e4b41283a6e493623487aeba746fca4b3b75e5ad72eae1b2dff2b43331af6f9

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