Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c7d9f57b3210f2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 21:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54541506f7951b8942a6f7446e9b2186 SHA-1: 66a3df3d5fb1b0950009030d7344c4d19e544c08 SHA-256: 68c7d9f57b3210f218adccc64b56cdae2c5b13437881a6e603722af8a569b6b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://irlanc.ru/uplcv?utm_term=unable+to+find+app+in+play+store PDF link annotation
    • http://cesarrodarte.com/userfiles/file/togakuzomex.pdfIn PDF document text
    • https://synersys.fr/contenu/file/74692903941.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658a660752---25706340597.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/fufemoduz.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_861E8350C639BEB4.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613255592b2cc---93331658981.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/18134071050.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/topifuworuworitenoja.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sivetejiberaz.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/lenivasumexidiza.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/50274274782.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/gugoxabolitalev.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/wituvekezawidigodagapi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/9653807197.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/15611471108.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/nodakitifiv.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/2871954256.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613073de3dfe5---balokukisabaxar.pdfIn PDF document text
    • https://biocoils.com/img/file/badafozedatemefidigunu.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/63416080483.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/zipalewiwudaxibodif.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/71313917600.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/69904524056.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/tufupekamafafirixa.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 18340 bytes
SHA-256: 879b5321dc195a22cb39f37af539d9300ea2946b58b72dbd1dd8f34ef7fc2882
font_01_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 10752 bytes
SHA-256: 9dab20d5bdb756c4363ee57d66cabcd5e69c6ed06c6ea459c2958b6c3523bb18