Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d58f88666b04edd…

MALICIOUS

PDF

117.8 KB Created: 2021-08-14 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a943d8d2d4d39087c7c301da48c06f6e SHA-1: fb05844803bc66fe5ea9ed3cf7613e3a20e2a5de SHA-256: 9d58f88666b04edd39e4bf627235add8b087090fffb2fc78c34ef96d8a16dcd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, with a high ML score. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b400162d---resegujifepudigitep.pdf In PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/53312922822.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b807d8db92---7192374252.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/wobefagupus.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/70719480676.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7171049319.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/12498686104.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b57b3ec---77673584882.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogumeboligitogud.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pufovifafuzi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f982b085d7---38316143332.pdfIn PDF document text
    • http://risme.vn/files/29803907660.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/nilusifab.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0397c10b3---rexojusevo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af649c4536---dekibisalikigujefegisilal.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/rokuzejepedurilibugop.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/40120837179.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917483e1532---44735989104.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c0910b88---tapugajam.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/34150822073.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/96712513117.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/825fd27cdbe6422782459918dfd92db9/12285243745.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/naledu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+beyblade+burst+sparkingPDF 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_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 37004 bytes
SHA-256: 1c41099f447c8ce19d504d992bb2e25005b9e27645fe76408576805ce16d1e0b
font_01_sfnt_off000168a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A8 10988 bytes
SHA-256: 47cb4f9a5e2d196de69319ccb92294e048cc783839b8f50363f4ac40a993c8aa
font_02_sfnt_off000181b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B6 17916 bytes
SHA-256: bdd2a79cc96c549e23e80967efc0df82e7039be3f5379e1357ea637218850aa4
font_03_sfnt_off0001b086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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