Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e7ec795131dfaa…

MALICIOUS

PDF

86.2 KB Created: 2021-07-13 23:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 526be48af01590615effbe548523a828 SHA-1: dfa92304a8f187172354b8d374f226c7acc837e1 SHA-256: 57e7ec795131dfaa199968de071b1433f04aa9a31047b211dd1cc0a4b4dc9e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://inwebjor.ru/uplcv?utm_term=the+crucible+red+scare
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b40ce99ac---55471099267.pdf
    • http://indel.sk/userfiles/file/damuvol.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee9f672b7---xilef.pdf
    • https://taevlingar.se/images/pages/file/8284654864.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b8b69a34140a83605888fb035730481/dokuti.pdf
    • http://tuzvedo.hu/elemek/file/woziperiguluno.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kq4cenvap5a8r66kfu2kvotvcu/dejovixe.pdf
    • https://denizlihorozu.com/resimler/files/32702473509.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4319c3739f048cce54ca585662e4caf7/tabenajezozuwak.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tvhfkjvchnrf562s54ofor0ond/35189318486.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/7eea51afbe79adf1c0af191aadad3ffc/nosori.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/96d527ad583cdd0d81dcd3a670d2dabb/72866577045.pdf
    • http://kielcenoca.pl/files/file/96054607938.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9f056b69ae706638d1b7cbea90cdb09/51135296231.pdf
    • http://fsgzb.com/upfolder/e/files/20210707011724.pdf
    • https://ddshower.com/ckfinder/userfiles/files/jewiv.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7b0eea42317a7f89f371b1abe43bd458/bosexipe.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f165cc8291---resefofaweribatipuj.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6049f3abe---vijubeb.pdf
    • http://sattosushi.com/uploads/files/gunelefokuleboxanizo.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04725e9da5---mobigulilojasew.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98fe71baf---dulimukidoxanagevu.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b57cae9bca379e35412409defde24748/lipusesot.pdf
    • http://vorne-sitzen.eu/pcms/content/file/tiverodegokagexonisukufa.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bb759bcfe2f---tibemo.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e557236af51d762ad4b601c0d64937b8/vavuwonubasizibixatejotil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
font_01_sfnt_off000106d3.bin
3bebf56340280d90f98b2227703e94e28b1234b64670175ce7c259bd379775eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 17048 bytes
font_02_sfnt_off000132dc.bin
871a01c84f4e9b19a54134aa13b803360a7548028edb18f0b12a9efcc5061227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 10348 bytes

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