Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdebbb68a58b277e…

MALICIOUS

PDF

77.1 KB Created: 2021-08-28 04:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 194e96504829bd17dd71a4b0f6162130 SHA-1: 39e647d7036c27e0ba8c44e184a61e894d0f4575 SHA-256: fdebbb68a58b277e2ff4bebea59d6e3c878df1137100b27c1ee9ac8981a2233c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, directing users to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, likely serving as lures to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=government+expenditure+and+economic+growth+pdf PDF link annotation
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/panunu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7ostha251a4uu905ib3h75b6e5/jorewapagidojexuza.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/15729208343.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/63185702287.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/jutetobobudujod.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/81103652287.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/6968251440.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/bazugivuvaxejawavudifatak.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/15877470247.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021080803141170554.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25363543856.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/diwujesewukot.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gilebirilajujilaf.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d0df39ca---baramurov.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efcb21b06---82292062212.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ccdb95ae0ffbb7cce6aba651c01c0674/15036144623.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/mowodezutajewa.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o40mfrkp46k4qi82o9tkh52930/17532881201.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e1vtki20sauc44beqkookf8u9f/36288962768.pdfIn PDF document text
    • http://hanifeugur.com/image/files/31249728604.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bab8c874740cf15c678798b592569651/zitaxorirogowetob.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_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 11244 bytes
SHA-256: 02d4f5e4eaee6b4ec7f118e0cf8e39925120e36dec238ad7f7f1cb48e0c798c0
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 16748 bytes
SHA-256: 2f3e7f03f7510cec70269e2e0caf526b54219917678c9cfb83e5f456326f2c0a

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