Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff355e4df01189a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 08:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0954f130c9da3e4d936413fca53f87f4 SHA-1: 148669a40a0011b061cd232431e6b8dd8084f714 SHA-256: 7ff355e4df01189a1a73fdcbec408564a01107126d3309ccf4772c554f5f8831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bhopalliteraturefestival.com/mpsdp/uploads/files/satuwit.pdf In PDF document text
    • http://gowowdeli.com/uploads/files/94380709140.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80333068208.pdfIn PDF document text
    • https://camphacement.vn/upload/files/bezavowul.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/tijebogano.pdfIn PDF document text
    • http://stylekd.ru/files/lejetudojekum.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/nalazidepeduz.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jebetedazagorilojid.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/80671029369.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9913be67cf59f28e1999655d2bc036fe/56877010063.pdfIn PDF document text
    • http://humanlitech.com/files/files/71205436800.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/27472434384.pdfIn PDF document text
    • http://pinxedien.net/upload/files/77676627841.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/genat.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/kibawiluz.pdfIn PDF document text
    • http://progetec.org/userfiles/files/sutezukatovowikumo.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/52451006489.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134890d0bed1---2675902442.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/kimefunufami.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/tedasenarakesevosomiwusuk.pdfIn PDF document text
    • http://a899.net/userfiles/file/36112394132.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/sadusarezilidival.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c51257c0---42077497315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=canlubang+postal+codePDF 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_off0000befd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFD 16304 bytes
SHA-256: 55e8c87ac4477ce60fe45844868299e827b8485f59a26b129c8d89aeddea595b
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 10768 bytes
SHA-256: ca9f986b06e2b93aede4449baf34f1d5fa1ca2add163633504289784271c20b8

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