Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5f6746fb11338d…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 02:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f58659be1f0357d9cc88a0437003649e SHA-1: fa8dad01f6552422ca23fa96959e5860ce9ff7b1 SHA-256: 6e5f6746fb11338d307151faeadd3b3c2a8a928c5102805712a52172e494ee8b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/903fb263583a7823acf8d8372b86327c/vuzulovezedada.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/958bb88265bfe8547685922b192fb68b/13524554526.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/2f02f652b2ea1bd3579183b01f8c1592/nusareje.pdfIn PDF document text
    • http://cga82.com/admin/File/luroxiputuxolemexufuwojo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ef2182f1b124ad702dbf547e5f755162/6077490022.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3fe63dd8c11e91912d06f723ec59ae64/64899348778.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/wigulegotenikefufut.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/170625336856.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/56c1c566c86a4b3f5b76e4e679e00b38/fejaxutudogimovajewe.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070da290e808---80636620578.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ff64e75070c4962c9f3f5bf0fa6d3e42/nelitulijitafe.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e582b53e1a44560d2ec200d9e588a017/rizazixemufotoxijufasome.pdfIn PDF document text
    • http://allasclub.com/campannas/file/vumoxom.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q0tivm4j0dq4qs08fmva5sdu3k/88889573638.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ma8qjpf7emf4daobtsvn4hbjh1/vovevuduxunapuzisobumora.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c328ff53e48baf1ef5b55d38362daec9/ruwisonapotog.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/35379096737.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/50733566115.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/jimidovu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd456b963c8---pevexuxokinajeg.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c466762fc---banudiru.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725839e93be.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3543a007---jiluzoviz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e657d1777c---sasemugeruvo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/86975247268.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/galegux.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6c4fc7a03cb5a675213ac89426dfa711/sudomojobularufasaxuxotef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=caratulas+para+word+formales+gratisPDF 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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16988 bytes
SHA-256: 319a914f85dd2558a31166d3d07e1d6a1a473de034a0523a433339f82be89687
font_02_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 10956 bytes
SHA-256: 08e155bde7f65b2045c2d4dddd1d9c18c9e031cb5ea5cda405c83f20f147a586

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