Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e29792b36e6174…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 08:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d8f35cd77da87fd333a967effc61555 SHA-1: a2e4b795cac12d8aee3b87b39924b0872009635d SHA-256: 85e29792b36e617443b63407f75eba5e2eea7a78f4b87fe26b4cecf891eca62a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The primary goal appears to be directing users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://getsolarny.com/userfiles/file/93395772772.pdf In PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/51841894945.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ve80qkpdjmsa4baopi5c96do2/sezume.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/82390869841.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96786606757.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/dudanosawesemelomev.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/61543127673.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79368808641.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b1d939b180628d45bc22c31fbeb17e/kotebobikosagi.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/vofodobaxurutujopu.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/sesujo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/60185432504.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/73610250649.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163146426537078fc8a4e037daabe4.pdfIn PDF document text
    • https://swiz.eu/files/editor/pitiva.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164532b9fe---53864076406.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/36277697761.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/35382659455.pdfIn PDF document text
    • http://wawa757.com/uploads/files/10651797022.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f94348c---dorovobaporivesewuwuxid.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/15622521272.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/64908438376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+giver+chapter+9+questions+and+answersPDF 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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 15804 bytes
SHA-256: 64189ffd545251e44a0cfbd3a49520a1a81a6f7ac04b417e23246ccaeda7b732
font_02_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 11276 bytes
SHA-256: 5bf4ee2d7cce652972f45ca77cf1661889c1b74d1fa4e32d1e34e0470aa360c7