Malicious PDF — malware analysis report

Static analysis result for SHA-256 279df6c525aa9c9f…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 04:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66410369e8ea04ca742fce0ce834e87f SHA-1: 60594d05b02bfcc8fe0df960fc2896995013efe0 SHA-256: 279df6c525aa9c9f7fee4cf33561809789942354a325962d60dc7d6e8d9a9304
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 ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other domains, which are likely used to host phishing content or distribute further malware. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection and maintain access to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2405f2aed---xekerabugoga.pdf
    • http://rund.cz/UserFiles/File/lujopazot.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/lorolulusekedunid.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/c74b59b6f4bd84fa0313dc914ec40589/manojakilagubefoser.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f88f87c75---21039944220.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/b3aee134a94c7d2114f4f3fac71bf527/2894396570.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/412c3a02fef1c27e6f050a8c70466873/damolitu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445d918090---79322389316.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/giwajetef.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813465726ea---tujazepobotumuzeze.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lm5d28i3if92lnp3r8i8u0gvmj/zuvoziwubal.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c860bf9b049---74909930076.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ccd4b53d9c606068bf0d8bbcacb38374/voxixu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b42740d17db---51989011949.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a2c6fa5c---50013315342.pdf
    • https://africanresearchcenter.com/userfiles/file/70827017725.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gprqqd3t4egc59k56md7fbcfp1/sexit.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6b87a884---96324129540.pdf
    • http://stlnsk.ru/uploads/file/bekurafetavokogilefa.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608855b494369---metemaweti.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/71ed024aebedcfb664e64a0eca878f73/fodemesimimediwi.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5b2ddebed57c67e6d79741d12d10f04b/50596228837.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b263ce0ec353860511a831d003e322e6/61186428814.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1494438df4b944f0767e5d2acc24edce/76793876070.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1obvnuen0uo215ikjh867turri/forixeluriviwigi.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a813901b74e---99629871335.pdf
    • http://bhttourist.com/upload/fckimagesfile/divun.pdf
    • http://thuduchouse.vn/pics/file/86523662692.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cooking+fresh+red+beets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2f.bin
96eb57e4eaee25a06307ba6223d542c0bd0c1d79e67edd893a152bb242fc8a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10688 bytes
font_01_sfnt_off00011273.bin
246cf78e61a85dcdabc8373dc422d41658bbee506b7456837b1534ceab03b860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 17360 bytes
font_02_sfnt_off00013f2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 16792 bytes

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