Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85643ea38553dfc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 14:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66d2f30362c0e3043e433496e1c45785 SHA-1: d5713deaded739ef55930174dc19c2dcfa3963fa SHA-256: f85643ea38553dfc4ef87de503f350da49741a991db8b0b9a53a9dcedb4d92c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These URLs are likely intended to deliver further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=pokemon+randomizer+gba+rom+download PDF link annotation
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/zadoga.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/51236617520.pdfIn PDF document text
    • https://edarky.net/data/file/64418263036.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbf467fec---89360394152.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140317d3bca2---kolekibomovubej.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/35762335066.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bunatuped.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gigin.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/77390484695.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/23725417020.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/60890083124.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tudavige.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/93846146780.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219132316404257.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/47087252456.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/dugorazisizijopizifasetav.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/67246304662.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/sirorozetinu.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/16453713923.pdfIn PDF document text
    • https://ka-base.no/images_content/file/84905163354.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/dajepelugo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/805resr3pak3i4ck02pd6atm21/xifenarijitudelewopowi.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/semalafavu.pdfIn PDF document text
    • http://186086.com/upload/files/5724640722.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_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 10704 bytes
SHA-256: 6aca0643244bd1c1c0fa48d9f52d54b4990ff273a5089f28308fe10affb3d062
font_01_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 17688 bytes
SHA-256: 4b4c76466264cdeb4466fbe8e3d729beebe949835e6cecfdf9ea0a48e2eb26ae

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