Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8464474fc0fcd0…

MALICIOUS

PDF

105.3 KB Created: 2021-07-02 01:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e75faca80e412b8e9bb2e8d8243d67 SHA-1: 39092be35850f41208207ec6ceb63e78570a308b SHA-256: 3f8464474fc0fcd06a3d25306f66c11aafd9cc7f5e574b539520e6c6b32a6bef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through a chain of links to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7535ded3a36d1c5a6010893dfcc420b5/polijezupurupuguwagalo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0c0af1b4---poriwuvusawezelanadolavas.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n3n267h5n728ih5bsco3ils1su/tegabisuzojopepixolodi.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b624f514---91401977378.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9602a6e86e---61060264926.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1ojodfpp7s6538c0he6cko7f2c/gumubetatujirutexiw.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ee434b2e---18503484924.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d436d2e3a4---fibilinadixex.pdf
    • https://dynasty888.com/image/files/20210615_085504.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a252c7e1a17---17191797186.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bcfa45bf7f1ae9f4048547b9d17635c9/61038038013.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8d1906d11d624378e6b609019a69b926/43431745820.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e1f10c3f---30903388225.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f436f7e216---81403977854.pdf
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/nolovodukon.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2db1cb83---3091027769.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0jorlb9tsme451hof1qu1hakso/xisageladimotawomodekofo.pdf
    • https://alyosserspneed.com/userfiles/files/siwixupotomevagidopagaw.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c2e4de12c51b2f09a96084f4ce0fd4e2/1289362286.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589e80bc55---tixowujijanugikopoj.pdf
    • http://www.odnpoznan.pl/fotki/file/file/rawokibubatirete.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b92b900d0c5---nudadabulejirojewalivuj.pdf
    • https://daaeportrett.no/upload/file/19732042914.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/510112a03863e4086ba63c160301fe84/18662017761.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=matlab+a+practical+introduction+to+programming+and+problem+solving+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_off0001321f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 16792 bytes
font_01_sfnt_off00014a31.bin
8947e9cadd503feaa56f0d33823f5c9640168d8e3b12d5167172ea1bccf7f633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A31 19664 bytes
font_02_sfnt_off00017d46.bin
dda49c936bfceddd5633cd14f3cfa443f0145e747d64902dbbab53fd28542ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D46 11260 bytes

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