Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5b93afd797f58c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-03 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8abfef689c8d8e83f2ba19f516f40153 SHA-1: 2ef6e85b988bd97a19f796c701aefbbcc0fc43e7 SHA-256: 1b5b93afd797f58cac966aba36ece44408fcc86dc572e2f9bb817ea178231952
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=cateye+velo+wireless+bicycle+computer+manual PDF link annotation
    • http://ntep2008.com/UserFiles/File/89665896204.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff920cc26---zikodowigawubenefatapub.pdfIn PDF document text
    • http://ises.ca/phpsites/vertical_living/uploads/file/54932464218.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/piruzefuvetu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1a2eda85b---muwozekarumelena.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/72074371732.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161218212ae25a---jabexabewulos.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/dugibetejetujokituwagovo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zivelegexokidixuxeler.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/borabokupik.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/50002621424.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/mavixaluvulonomofeximudox.pdfIn PDF document text
    • https://promise-land.com/upload/file/vijuxulo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b894469dd29---sikigetimewusol.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fbab8bad35f---94284810921.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abe44cd1f15---25895749257.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kebujixagobiva.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9e02de32---mapurifive.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/padibivupotikufakoxun.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/xesejuririkakiso.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/35795691884.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8f4b30713---sobige.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vubirepodomuv.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/78136333962.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 20516 bytes
SHA-256: 34be745f59c5cd20ac2fcbfe1c9724b9a2fe17b057897068379e332cfdc325c1
font_01_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 11072 bytes
SHA-256: 5db2d8a033c2ef04c9815e3d33e9e1211b795b04228a7a324cfe028394573a5c
font_02_sfnt_off00014c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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