Malicious PDF — malware analysis report

Static analysis result for SHA-256 352f4eeec53e16be…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 09:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93370540c99c7d6730b9bbf1239826d4 SHA-1: 80e9559c64cd58f99ab36158bc49d5f85e147927 SHA-256: 352f4eeec53e16bee6bbe650409b55e5b02e82df6983b10fb7ef6cf1e5bc5996
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ristovski.mk/public_html/upload/userfiles/file/93883162378.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/43960844051.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210913_6A34667A6BD4612F.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413666530d---vaxopuseg.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/rugiruzunewepogelori.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/79198279761.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/79872243722.pdfIn PDF document text
    • https://magerp.org/upload/files/70191007946.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428560a80f1---denewirisatorilidofuf.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2c9af3cd---44264066297.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/dorojojepe.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/suxaradulazu.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/suziriduzetov.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/75262931527.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/17641601751.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/22816552575.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/5193536422.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jevufujimopexotalajaxe.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89897411740.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/vanife.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/af2a752829284d274f9b5c7259c922d3/mikazuvawixapanapanosej.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/burulirubewoloremesaso.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/6486848309.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/fufemitutigapinani.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/fegidi.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/65138137416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+gta+100mbPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 17008 bytes
SHA-256: 1d72e38490feb058bc32ff00487233e8ea952338442d9949c64e1f698f32d6d9
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10500 bytes
SHA-256: 6193bc1204593fb5b123931eb87aea890c8e43911d577196d9990ad4fa802ec7

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