Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ecf72db7f93f68…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 22:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 204eb692b3b96a687ffe6fd6423d4f23 SHA-1: 6598368d8b580607430ad62397f25dcf2652e79e SHA-256: 35ecf72db7f93f689809cf1d60f6f4c69156185060c457b4705ae7fe02f7c463
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting domains. The primary goal appears to be redirecting users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://topflexsports.com/uploads/20854329236.pdf In PDF document text
    • https://parlagame.net/calisma2/files/uploads/51129668735.pdfIn PDF document text
    • https://dm288.rs/slicice/file/87723402691.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96448533730.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/vimobeliwaj.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909033725.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02b88054c---68754504901.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/27418178208.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1e9a8f77e173e12863f739dd51a849f/nujazirogevokuvuporinemef.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/88916739921.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/funiza.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/poqcvqah6mp8jo3ldvpadp7bl2/45774353815.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/gelexamalafetig.pdfIn PDF document text
    • https://huanghecables.com/d/files/vonowaborupodupoxe.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/nuxokaxufiwidusozem.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/bevexege.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/39242810143.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/96192171363.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/1006619266.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161342f26bd0a0---1607831325.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/643bbbb3b64835de01957183cb0528ae/kekuwaluk.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/85046337338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+apple+emojis+look+like+on+androidPDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 19452 bytes
SHA-256: ea25621a938c58a018a0e83c257621a6364f823b45551eb01cc761ddd9e76a3a
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 10872 bytes
SHA-256: ac29583ceba478ad42f0683e82223b67de6dcbe61f074fc82ed51cab470228f7