Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7459a6c3e518f2e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 15:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed032b1317d5d64d30c7800ed370b0d6 SHA-1: 7045b63b13af0cc67ec2ee2d9cf2730a39625d0b SHA-256: b7459a6c3e518f2ed769b251b1e6fa7d70e495dc0bd0bed918094bc091445705
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://cnc-soustruzeni.cz/files/file/28820513473.pdf
    • https://redac.ch/upload/wemagukajovuwenazolog.pdf
    • http://fsgzb.com/upfolder/e/files/20210914102902.pdf
    • http://www.parinet.fi/tiedostot/files/61986747061.pdf
    • https://ans5680.preneed91.com/upload/files/kabemirepusakorobebinum.pdf
    • https://baigiangtoanhoc.com/upload/files/66876275709.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147082a8984c---vufen.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136964ea7847---30532927475.pdf
    • http://solarissoft.com/img/userfiles/files/43307265326.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e8bbe442---vofutizep.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614357cda1f4b---katejupagufajesozatak.pdf
    • http://www.como-grup.ro/fisiere/file/89818096153.pdf
    • http://biaikatolikus.hu/files/file/fazoxawelujebakegutelaso.pdf
    • https://advantage.ee/media/contents/file/57077504971.pdf
    • http://studiospazioambiente.it/userfiles/files/tefurovawesiwa.pdf
    • http://skinct.com/upload_file/file/Fl202109050909276328.pdf
    • https://nutstudio.it/userfiles/file/92350249309.pdf
    • https://akconta.com/uploads/files/51624241511.pdf
    • http://koreaseowon.com/ckupload/files/xiluxudozogu.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/16168783190.pdf
    • http://kamerton.nl/clientfiles/67594338247.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gardenscapes+mod+apk+download
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e00f6ec1a103dc33b8b12014a2710630/79066827623.pdf
    • 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_off0000dd47.bin
e15031ffc0ced91851f2a53da703af0b66d388422aed3ded8aff866f39967e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 17232 bytes
font_01_sfnt_off00010955.bin
5b91c7ed3dfb4e0c45fe045fa9489fecf092ddd9cd87d9cf588a0aa1d604690e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 10704 bytes
font_02_sfnt_off000121f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 16792 bytes

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