Malicious PDF — malware analysis report

Static analysis result for SHA-256 87439d38e6605f3d…

MALICIOUS

PDF

134.9 KB Created: 2021-09-10 05:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: be579d7bd5e16feef60e733b45d07559 SHA-1: 9db8f78e90471b773695bcf8e82eedb73599d06c SHA-256: 87439d38e6605f3d92f07c15f399ff5eaf6e2793186bacc4d28743f3f2c53a5f
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, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary lure appears to be disguised as a search result for product pricing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://huntic.ru/uplcv?utm_term=iphone+5s+2020+price+in+pakistan PDF link annotation
    • https://hondamienbac.vn/userfiles/file/molezodiv.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/6514193421.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fugopukuwegusubonumad.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/zibanidotom.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/96940859393.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/16a87ca13bf83355b50ce91d597f5efd/rubitabalesepesisosoligez.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rf3mldr7bpd9ti03bcfaol6t40/16457423305.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sagoxizesusizaxo.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gobavugewade.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/52383606852.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/62720603809.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/24533988450.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cd424bb2---lulepemudowasuketop.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/rorodumimexirosu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sabazarakotiguvarupo.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunuzenijotumenojinopo.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/70433207921.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wufazo.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/turizefa.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/5639953776.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/89545303442.pdfIn PDF document text
    • http://tayles.com/uploaded/10571275652.pdfIn PDF document text
    • https://reha.bg/content/upload/file/vesotuba.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/zemoburefut.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_off0001a9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9D8 10844 bytes
SHA-256: 4ac5e0c50a4b02cf4c4d1be524a6fc80c0ff668ac9f7ce15bfca3ed844b52c41
font_01_sfnt_off0001c2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2EE 19520 bytes
SHA-256: ecfeaa77246c7ed3eea3b854f4ab275e9dfd50cf31c94dc901fb40833966058b
font_02_sfnt_off0001f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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