Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b2367e54fd0277…

MALICIOUS

PDF

91.5 KB Created: 2021-07-21 23:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c548040b306cadb62b424d4e856f8f5 SHA-1: 27de9ebf954a9f80afc3c51272e6bd2b6be6f04c SHA-256: 20b2367e54fd02775b2ad9afe82393ceddcbd927b0c9ac9699da6aab8ab9c10a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs point to various domains, many of which appear to be compromised WordPress installations used for hosting these malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/46dc5eddfcb86a3e13ef63077617754b/jiloturu.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc349ac544---mefaredobexefaguzesupeda.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9339f596bb---rijew.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210702_821FA2EF273C6030.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/31539135149.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/aab8456e84353d481bbe8b16ed38fda0/roxegopudazuxemewipuwinuj.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210527002248004892oz5xso.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tubaraga.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ca32f1c2---babamubozul.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608013e23e703---57953452682.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072d56554bf1---82904313545.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/59562460631.pdfIn PDF document text
    • https://airbays.com/userfiles/file/61865830145.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a53efd1abff01da4d89b8fa3bdd43db8/84399235915.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/99332461271.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/65909379996.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9799c031144fc21f41afc445abc44eca/28401795813.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d17e1ee039585d742c25ec2c3810f85b/51787350539.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/tiwunexugaw.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d157eb0f1c---3947288843.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/us9o25ciaus1dt2mt9mqiedkft/bitegagigiturim.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d5f1e597b4cd8d3e9ab7cfd568ca9d86/43878490946.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a3fc7b5b79cbcc79eec73ac1d3d0401b/rijevubapiwobewi.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lezajude.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/fuwigebozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=direct+winter+sowingPDF 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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 10284 bytes
SHA-256: 562a6604c0bf50f016395785ae7bcaf369a186d39a1e1ee5ff737962d641baae
font_01_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 17264 bytes
SHA-256: ef58f8bd85f6ed2f3b866d88308b27dd5ed4a032218965d9fa146fc226973844
font_02_sfnt_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1