Malicious PDF — malware analysis report

Static analysis result for SHA-256 29708188341bf462…

MALICIOUS

PDF

83.4 KB Created: 2021-10-11 14:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 76acacaaabb3348af2279dfa46c17e58 SHA-1: 3a6c3b06603c24205eee7ca08711cd5a1469958a SHA-256: 29708188341bf462b6a0c082203008c952d6bd82ba8d6a08e833b969411924d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://flomojapan.com/upload/files/vimozejakagaf.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/75031670773.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/debozudoviwedadifesija.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/nomonivabesenakojotu.pdfIn PDF document text
    • https://swiz.eu/files/editor/linevim.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/21267835975.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c4b39656e9---jotasaxemopofuwi.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/raxilulozewijunanizo.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/15242745582.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/nubugobek.pdfIn PDF document text
    • http://hiniceshine.com/upload/dozoxitinoza.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/lerujototugidiga.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/mokuvunivur.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2931929d22be384a17e578fb10e43ca0/tuxuraberu.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/76025209114.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161523e1b94c07---bipepomowigugonalovakeno.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/zoruberakilel.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/59409561405.pdfIn PDF document text
    • https://sportscientistsviews.ijmsir.com/ckfinder/userfiles/files/70254731483.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0b4cb1b7---tabipo.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/53495809033.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/sazuzuxe.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/vomatofetululukutimaxor.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=pentane+solubility+in+waterPDF 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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10544 bytes
SHA-256: a8057ff17a8ffedc40c764f9e9511a1a16033fe15b663c0383a1f1ccf3070111
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 20040 bytes
SHA-256: ab9f3161e613c36961d5c03b295b0ac8feb60f784e38a359fc11e2142db9c16a
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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