Malicious PDF — malware analysis report

Static analysis result for SHA-256 729ec9b7e85efe54…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 21:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: df5e73c45670d3a460bda303b5b8675c SHA-1: d55efd1fd2fc73cafaad4fea580478f51d94e3f7 SHA-256: 729ec9b7e85efe547c84ca64c06fec71f77d88b44f9cee0e29119b1b93831c15
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised or malicious websites. The presence of links pointing to compromised WordPress upload storage further supports this, as these are often used to host malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=pocket+rally+lite+apk PDF link annotation
    • https://appvid.eus/userfiles/files/56625723143.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/munumesiweganitipojupu.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/13512138929.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/53738995722.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/10377936695.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/83576872783.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/66b3f46114aec84ea470aeed14655fb3/japubiwebute.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/88163882453.pdfIn PDF document text
    • http://popeyebio.com/upload/files/76098903706.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/radep.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91311535808.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/51481988511.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/72455543956.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425e5224506---pesaju.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/85312211857.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2497d3d2---mamukesusarodeda.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/73588878649.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/61131155434.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/35767300070.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a7c79d70---60280667597.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/69866868029.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/pugolawe.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_off0000ae54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 15920 bytes
SHA-256: 772caf10a99c206e6b3228c7cbf3c05cad5d4c492bb2b7b7c2f2d6d098498c96
font_01_sfnt_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 10304 bytes
SHA-256: c2e50f39ef448b5c144ef17b84e157447fc9d4552cef5a64d50fd7dc7cb82956
font_02_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1