Malicious PDF — malware analysis report

Static analysis result for SHA-256 904291b82ff766b1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57dbb3793aaba78fca2b9e6d1b1d3bcd SHA-1: c6fe71861a71c1de7d3885112d08951ec8c2450b SHA-256: 904291b82ff766b11d6891d633678754e2e2a5f399172ad9653b7ee2a26b1041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites 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 through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tahitotfaluovodak.hu/ckfinder/userfiles/files/jedowupimak.pdf In PDF document text
    • http://integrotech.com/zdjecia/file/zidimazegofese.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/webipeverawarus.pdfIn PDF document text
    • http://edituj.cz/res/file/nodefakikazewugatuximiz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b708342e53---jolufifojozalajuginoba.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cf6acd7333f2e9654326046d4a46502d/ludonipimis.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b01b514e3b455dd27ba43a3f90df68ed/97143784121.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/35472961213.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/17182769641.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/kozezitanodonobubob.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/63097147095.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/11905738196.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/talalogejowiwo.pdfIn PDF document text
    • https://mikludava.lt/images/files/zerilomeja.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/63041802064.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/15064975865.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/pawudagu.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/39705452043.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/vemimox.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xiximuvomebokafusowimuri.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9386a91fd9732a36bd4163dc012088d0/xibutilanubaz.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/gilisokitexa.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/ruwekodijukuzop.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/xorixomimesovozolulugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=silk+touch+enchantment+idPDF 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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 10636 bytes
SHA-256: 219427a122310fd2ae951f27877fb32a14dccb5bec990f84fc0cc82561cc6c29
font_02_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 16040 bytes
SHA-256: 66f1729cd7f29954178cbed71abc54f189cf545baa09bf23a6679adc651fae56