Malicious PDF — malware analysis report

Static analysis result for SHA-256 3293c17073de9272…

MALICIOUS

PDF

75.5 KB Created: 2021-10-06 06:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b02ab6087454b0b91cd1f99169f02440 SHA-1: 01e93f0de136ceddf961161e88a6532b9b6d5175 SHA-256: 3293c17073de9272df363cc9f68414a15486ebdf4de87d8eccf8b6e800a0d8bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=feet+into+meters+formula PDF link annotation
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/teberikit.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/divupujegekod.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/79923869058.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/15628547446.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/rerigela.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/2751808095.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/fizizetafisuzogekiterot.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8818be09d---vobupuket.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/narupugulisiv.pdfIn PDF document text
    • http://emeat.ru/var/files/3069581299.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/xomafisojuketuzene.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/pidisomu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b361daaa---retitolenal.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/sikatizuvutezafe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gefnbq98bjn15iqr89ic71o139/nalag.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/d3kcm597obdsq55le1k8g2n99p/69755638565.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/fegepej.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/delujesakunifesaxutugesoz.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/nobinaj.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/12054117176.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/92746054440.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/wujawizuvazufasupimit.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/napufowuri.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6a1888d4---dibid.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_off0000c500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC500 10452 bytes
SHA-256: 90b4cb46f6819192c9a5033a94ede9adb5bbe619fc5e68852d1540d12397713b
font_01_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 17008 bytes
SHA-256: c6f9e1b731bc92b9e2fb11b4b5f7df97a417d4e369178c3b9c977cf35eb29e69
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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