Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e5cb45f3015608…

MALICIOUS

PDF

93.4 KB Created: 2021-07-04 09:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4256dfdf7d2e2109ce2824d1cd7365f9 SHA-1: 1c8e7a7351da35b31bf713a94623655ca3177aa4 SHA-256: b3e5cb45f301560872ebc9e5e92471a1de8f9897a000d22ade2267872991d041
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of form-craft plugin uploads suggest an attempt to obscure the true origin and purpose of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde96d8e85c---42189645341.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc20b820f1---xozelefilixix.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3914d639697d573a604aad7524ee2cab/61245472814.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20fb2ef8f---6437383732.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/94867208455.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/uv907ui4pg9h7q223n650q08fb/46482614683.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc049349c8---55050021730.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kc4q1canct7ic9j8mq705n16q4/mepit.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ec0bb0f03e8f0abdfb54f6e2ef873ce2/bukaxatul.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/abb79c468f316ec2bf7960b36d4b80b0/dafadufejijazebevem.pdf
    • https://verandapattaya.com/userfiles/files/joronapemesijebodemiza.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861beb461c9---samewafovukiletagibaj.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/88470418373.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a67c5677f2948f106e8c92f53e2eb9ad/75166683758.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/efd410582883ub03m60rncmos7/1963331378.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/on9aue6esa3tfp8u38rj8jcr66/27803807671.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210515092323.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b403670d9---zibazajameb.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f08f2ee85---vadofaginiz.pdf
    • http://marta-galan.com/files/varios/file/sogoliwodosuruxewom.pdf
    • https://zahnersatz.pl/userfiles/files/vogenato.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/12f87c17a4f497e5b3f0c4275c78d6dd/63723861270.pdf
    • http://washchienluoc.com/upload/file/zevekatofulame.pdf
    • http://abpaluso.com/upload/file/69506227486.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/548524a24fb12b0dc025f9931051c68b/66058140750.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bond+dissociation+energy+and+its+calculation+from+thermochemical+data
    • 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_off0001035a.bin
ee48dd191e4b54e6b0a1280c10bb1c40d27940d2a72d1d513c952609597f129b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 18796 bytes
font_01_sfnt_off00013584.bin
a6e1fd70862f9ef3d11e3a475b618f2c38b8ebfa7ce60225752eb5285dc7e630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 11192 bytes
font_02_sfnt_off00014f67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 16792 bytes

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