Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7345a81fbba44e8…

MALICIOUS

PDF

91.0 KB Created: 2021-08-13 11:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fcfd39c0960cf1db1e4d624dfe379e8 SHA-1: 69d8e0b554e0eab0c2e4c9ee5c1fbdd98929c0bb SHA-256: a7345a81fbba44e81b160cf48cc86f58ff7cd4ef59bf72c928ef3e53f1151b33
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers 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. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://microsolder.hu/userfiles/files/matuxamadotixe.pdf In PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/40748580296.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/rekomatopo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0536c9d2---jirawexegoxanikoxezinofov.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9c22a689---delidifukiputepedemi.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/tataxodujabejasojidi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e2c07381---miwizijigipokig.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/segubosutemibowifinu.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/91324888106.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/83621641444.pdfIn PDF document text
    • http://greenld.com/userfiles/mefofitewefetavi.pdfIn PDF document text
    • http://kezmosas.hu/files/file/lajosizikal.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/59154893686.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeada13b7f---84099979206.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/127e417f85623219b305b691760aa4f2/52925387733.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c623cd2075e77681bcbb8bcaa485f66/29316136630.pdfIn PDF document text
    • http://momsystem.ru/public/file/rurosixinivowu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bdca78ade94843e5bf18e4b4ea33759f/veritibazigenatepuwuxu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210813153458_pr99ir.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b155a6b7b19---taporizusozisofat.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f295850c58---lidevefezufowajapimebeno.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/85d64e8ed8f442f52ee3a8cf17902f14/gobewozolatudini.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/60hnrrmu27vqnvc3m2vo862b2n/muvajamulur.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722bb4d7c92---tilojubut.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/83386568990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=troy-bilt+pony+tiller+pricePDF 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_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10288 bytes
SHA-256: 582b4e474b349fe4c2fda90af84ac28fe2a87943a7199288ab19e97022f42a05
font_01_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 16380 bytes
SHA-256: 1753df4a793ba56b0111fd359110600a198373f5ddcb78353b772762696fe99e

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