Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2e1f38159a6c7a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 05:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f9066cf029dda1f38ffcaad48d89978 SHA-1: cedc38dc6bb7e68fdaf187de10e967bc8b95ff6b SHA-256: 3e2e1f38159a6c7a1fef9b3aa1930c6cff9fd7015d21ebac2abf222418bb33be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=transformer+un+pdf+en+word+modifiable PDF link annotation
    • http://kimsanghun.com/upload/userfiles/file/2021817164124800.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a3e7ceca9c73f19f78bb592d5b94eecb/gibox.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/loresomugiko.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/mororawopeti.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/raruxopexidupebu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/dalegeru.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/3790350553.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/17618809990.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/voderufulisozigosofu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/befugujew.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/wisujusu.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/68890590063.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/p4ukg99d41g59er0mauo28u82u/53982792604.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b1813d28a7be363886b724f50da14872/bexafasiwekowerukom.pdfIn PDF document text
    • http://esistore.be/userfiles/file/totegesule.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cp98eo3hif8mfhm8qvdjt86dh1/23356112085.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/14815421954.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/19104882292.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a7eb4ade67d53f0d672aacbf8703fb33/85192839638.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/21812979108.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/riginatagesenep.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5ea33acfcea083b8bad7fe7f29c77842/66433368556.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/xitaketidado.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tifowofut.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tv61erhl55l73j0mi6snj0fkb8/judapolezin.pdfIn PDF document text
    • http://elitvorota.ru/f/file/gufitarigodotozuvipebu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607c249f74df5---26531681842.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_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10852 bytes
SHA-256: 8adf2579bdf064c21765cbb8c8c827fdf29c370b475fd572e2304dc0e0dad3ad
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 20808 bytes
SHA-256: 6a0e34145216b14b0946b1a21540d5cf41c11216a00f3ab27e85499cf81a0c21

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