Malicious PDF — malware analysis report

Static analysis result for SHA-256 839c311eb2660490…

MALICIOUS

PDF

85.4 KB Created: 2021-07-25 00:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e4d68d91a9a874804fca5e9ae97be9d SHA-1: ec6723076cbcb3b5d1aeb259f8ef4ac41cf61244 SHA-256: 839c311eb2660490195e13db31b1c7350682b038145da733425acff3cbbaf8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ugpe8fe1btrikv42rvriia0677/30016062770.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/43888716623.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710e9b06f3---funuwawele.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/617bc2f160a4f2a182ec1479e2b06bd3/vebaxuwigox.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bccab6377acf24752bd513be553525ff/tatekipusidisemafama.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f6667e4e7a6bcc4aa9cfa469822f1bd9/metakidovilurokam.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9c1df62c---jodenazapizaxezib.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/2082470724.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4d72a53f41993fabd7b13a614815f69b/badubofamojubigulobojek.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/02e79e3ead97ef34a81b8fe896299599/57948516263.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/nawudokotojo.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/doligeparoxokupasok.pdfIn PDF document text
    • http://rsst77.ru/upload/files/ratupakoko.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084067cc8a40---povojavegi.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/texojo.pdfIn PDF document text
    • http://aqcons.vn/upload/files/41518466016.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/95680618679.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160719fef3a35a---10728909592.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/padugokatej.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/62625455139.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/93929788973.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/66725072357.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787e70255b1---tinasuruvedagazakeg.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/juratod.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8b774645---duwudifasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nys+court+officer+examPDF 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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 10640 bytes
SHA-256: 5b147e149ee830d776d16da2f40d16f24aee05e896e47e6636dbea71cb00c99c
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 17624 bytes
SHA-256: 634216929d3d03fea2be824ecb41f4bddbda8e666ca666e3bfa7b6a99cfdb90f