Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb2a448cafecd46…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 15:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99c60ba24c663446379b8e7ad2a04682 SHA-1: 00538e5536b1431c012afbb239ff8a7f84e90754 SHA-256: 6fb2a448cafecd4621b3e0f3c3e2080f8359cea7b775ef4e62364f2f5e2a8d00
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many pointing to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs suggest a pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=five+and+a+half PDF link annotation
    • http://fantalife.nl/userfiles/file/20667426906.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/xumajulezepusavu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/figininedunuketitake.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/derewawo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/927445746724fe92cedbdfccaa9261b5/japajab.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/51670341442.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121cfb9ded97---sejamoza.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/39839811569.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/70873999754.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/pemulagivawinoga.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16117787b835f6---46172027259.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50130c17b---6851260902.pdfIn PDF document text
    • http://szpk.hu/_user/file/8666527725.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16106070670908---78797928924.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210716_52E49A93417CA7EA.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f928b5f20---xowibodikedopuvamo.pdfIn PDF document text
    • http://nensi.si/upload/file/xozujuwel.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/32909674160.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/8270723342.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/rewetok.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/pesokiligurinotedev.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d0738ae13acc830960e67dc7fd14765a/54941690523.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/boxelazubovezerosutezot.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sexunawejazo.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 23460 bytes
SHA-256: 79f8d2dd2468edef65fecb45447844bde6b4f052d6a408ac9e8f92f6a61822d8
font_03_sfnt_off000144ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AD 10008 bytes
SHA-256: 37717d865ce69eeee7c90ce88c001eaaaf94788ac2e7d69991a13637bc279300

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