Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe64c0910c36a8…

MALICIOUS

PDF

84.1 KB Created: 2021-08-25 13:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 338b91dec7575c26916a676e8729a39a SHA-1: 84060770a1b6dad2dd903a4f93a4c9479ffe2fac SHA-256: 1bbe64c0910c36a89cb2a8506e607e8da950d8c7feec72b65d1ba8434066f5b9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the embedded URLs are designed to redirect users to other PDF files, likely serving as a multi-stage attack to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/46279dc3d123ee208a52edfe05bfb673/juwodiniratotenovasufo.pdf In PDF document text
    • https://eslms.com/userfiles/file/wuloxekarovi.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/60697955842.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4005147842.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/gagezukiwuderifixusapuk.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4jq51i8tu32g974ui33nt6l3h6/55416913767.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/33198592806.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/66090353038.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/35244968854.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/99554497919.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/90365504755.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/ziperod.pdfIn PDF document text
    • http://yilip.net/userData/board/file/lunaralamozade.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/50931078471.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/nineladotalorazisivenuv.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jizilenusutawosaxurakix.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/45087848334.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/76325733333.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/49990518457.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecaf8c3dec---27869940944.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfd7e88989---99107073096.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0a351cf847623f305a414601e2c59222/vosafasal.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/86645296962.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/5658430917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=houses+for+sale+in+edgemeadPDF 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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 17896 bytes
SHA-256: 645783d5556430fa4498388c0ad11d799a703e8fa8a1b5ba2583d6906d4ef5ba
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 10692 bytes
SHA-256: 61a9a8ec9bee7c6e9b249a5b8579c1b079923e39b6e060ffc524960a23b5d4b3

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