Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c884605b9e4fd2…

MALICIOUS

PDF

118.0 KB Created: 2021-07-01 22:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba36a88ea386a02d68df4b0b81bdf990 SHA-1: 159e67bee1aaf1b2c15fb98b79cc389bb5948ca3 SHA-256: 93c884605b9e4fd25b7df8073193149ba44e6d52e862fc6032215e9f547a6238
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of multiple links on disposable hosting and compromised CMS upload storage further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=the+undefeated+hemingway+pdf PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683842e06c---kijinuwafoviwoloragume.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b171c780e---nujoxawegasadanokugafu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84a57ee4e---5601630846.pdfIn PDF document text
    • https://castel.ro/userfiles/file/jubofonoxezegijofe.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f78b043bgmb7k2tonb3fvpkn3b/66483555432.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a479b16205644466b56db1b45940a96d/71097069336.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/raterugedupexolajopufatu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/kuvizifelusirimuvigifi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/kibimalipomenaxam.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/65430960313.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/61576871545.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66694e5fb---95463885715.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/v6h56puqg3v3cinsuc09voraib/wapiganezisuviz.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/56729132074.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15dc3c9cd---pelifotepemitox.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077a92c0d443---timilikoruxiredamebe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a0404a49---82983987018.pdfIn PDF document text
    • http://rld-carbon.ru/file/sawojaripiserewaxopo.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/46006675369.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609edea59093b---jodapexesitatirala.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/bc5bb5481f78e2c0ded64972a4bbe110/76109340739.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/refuwulobitubijovidudijuv.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/dd2bbc4414efb7aa70fbea23b2f81a2d/16534610999.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb48882783---jodepujemu.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_off00016d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D57 17356 bytes
SHA-256: 425334870a03cce6cde69d64a5ae3aa4e9e033e0141a823c4f25d254be7d1bbd
font_01_sfnt_off00019a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A46 10772 bytes
SHA-256: ab57fd4f88fe586f9d7a63a0be9372d12b93ff260548ccde585a3cb92a60037e
font_02_sfnt_off0001b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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