Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af58f0ddd79cd5b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 18:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48ae0bb9b67ff8a426bc0c337ad22e65 SHA-1: 5d29599f7d28b35b55ae6a41cba5ba742bdad048 SHA-256: 8af58f0ddd79cd5bcccbdaf47a3336a8a318aa8470e1e8b4ff44cc30854b88a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://coretry.ru/uplcv?utm_term=the+l+word+season+1+putlockers PDF link annotation
    • http://tubesealer.com/uploaded/file/32370417661397ad7cf264.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6e4bd2191b3475b151691706feca8b23/35319957393.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/86587109236.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/10899247635.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161304cc2e0f12---pukiwexopiw.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/13363297121.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7a4cbcc---76803431821.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/xafimujuwikag.pdfIn PDF document text
    • http://8njl.com/userfiles/files/bavezoluseziruwuborojog.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/14600331208.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/mumigewodipuwerunonidude.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/24337699214.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/wifima.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/gezatojurugabozoxufifa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336012759f2---noramipovegavakojinop.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/75890692310.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/86429458810.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/lusap.pdfIn PDF document text
    • http://davcpundri.com/css/file/86937281422.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c037dceba1cb71a65a8572ec938086b0/rakudegisodovovawefej.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/jakemaxopobefejupibajexu.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pemafamalemimuk.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_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 10812 bytes
SHA-256: b2891a3200eaa1db52a876646a9efcab64326ce2ed98afe9a1fc0fe8667e4acf
font_02_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 17164 bytes
SHA-256: ab9d44419a1827edd1113bea69a0f5ac11cf292be3981639254bcc0cb6d85a82