Malicious PDF — malware analysis report

Static analysis result for SHA-256 316c89a231e275c1…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 08:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03181350b811c3070491f19335d52198 SHA-1: 366fbfe40cbfa94da20f5b3f0f8b92204b947a6b SHA-256: 316c89a231e275c1597fbbca10ea22476ef6df0ae6c76255ddad8b40cd54a393
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=completing+the+square+graph PDF link annotation
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipuraredere.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/lemawotelomekofikibebet.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/82590030692.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/58669134705.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/67fd51d365f3a543e5ed1b8a9ae2118d/59948146097.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/dapavunevibadileduzoba.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/61456767843.pdfIn PDF document text
    • http://cga82.com/admin/File/85116734139.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a5ca01d245c3f59f724023aed9a062df/kobik.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/67e6ac18d94c061be6baba2ff2fc7e6a/75274945218.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/35380349490.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/monudazux.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/09052651258.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/42052401480.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/dewubasasukulale.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/beketadu.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/5351755931.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210905035136.pdfIn PDF document text
    • http://taxfreepoint.com/file/38982533908.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/doxezavuzogagulirulebele.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/94404812305.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/59280401337.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/9168691400.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/jikosidijurijavaju.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/72672914234.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 10976 bytes
SHA-256: 72d4dc383d56d56312b58dbd7093ebb2dad529e24339f886a0601c4758974cc2
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16656 bytes
SHA-256: 87405373614929c40a9a10c8df138b5700ce7f1bfaca23ec9ab2b834a27ed7d8