Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b6538c8e7be6cc…

MALICIOUS

PDF

114.5 KB Created: 2021-09-01 03:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b556204fcef3ba36f34917e4556fa3e SHA-1: 55d98ed479e74afd607a8b5c26c5f270da129799 SHA-256: 32b6538c8e7be6cc1faef228b0d82e3c71f3c85ed0e58cf10cee167e71639c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to lure users into clicking malicious links, aligning with phishing and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 6

  • 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.
  • 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://vntdc.com/upload/fck/file/dabul.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8282acf6103851d8be9fc6eb66cd4608/58601956322.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113c5a8826e6---bitumesikewizatabadopuzok.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/71707300213.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66299bd198---tuvikig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a451e668f---17614070663.pdfIn PDF document text
    • https://5uempat.com/contents/files/34153047607.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l122ljonjng58h0qp2fg8ifjrk/wetuxexozarovik.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/gulix.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/80843102433.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/radawobojuvuguxaxe.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jidoduwogagejowanuxituxat.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/fatogowinomalokut.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikixajepobezinim.pdfIn PDF document text
    • https://rinducm1.com/contents//files/28105504644.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210809_182400.pdfIn PDF document text
    • http://reylab.com/userfiles/file/26116004800.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/rozevometu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/75306132745.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/24041202421.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b445b21ef59---zigiwigobekaresu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/rusesiliwam.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/rijuzuwegopimoxizixox.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/71176285739.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a9b2d4f5d9d3c239fc6d23bcd7196a93/tilefuwagoraruxujawazedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=20th+century+orchestral+musicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001545b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545B 10856 bytes
SHA-256: 914237465700d5a26b60ffb13d00064d4e04d83f4694be8533fe09109e014358
font_02_sfnt_off00016d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D51 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00018426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18426 20680 bytes
SHA-256: 11d75cb2459586583991ba486062ddedb3084887137ca3a51b4c79bb53c1d733

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