Malicious PDF — malware analysis report

Static analysis result for SHA-256 853d5a955b284f2b…

MALICIOUS

PDF

82.1 KB Created: 2021-10-05 18:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b5e370453b802e29803e1c546579bf2 SHA-1: 34f1d3e9420c115fe532e8427cd9ebefa1069f94 SHA-256: 853d5a955b284f2be89f9888d63a15aeb7745d0401fab95ce26b6af7b1bf62a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, many of which are hosted on disposable or compromised infrastructure. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves to obscure the ultimate destination and potentially spread malicious content across various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/mukarukada.pdf In PDF document text
    • https://kalashad.com/userfiles/file/5942640013.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jadamidibarutufageta.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156b8a400739---dajowitikokazulop.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/89515703105.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/tapijurow.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gefawosavuzivumowikevixig.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f1790e72450fa90e1c12632ee98464d4/soranafibijatawikawuxa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/22736046481.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/62898749459.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/dejexemedi.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/63270750672.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/91311225423.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/fudegibuzotugopevimijite.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/8479700321.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145003f9dc31---futupilod.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/fakivunujejiwame.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/totogogozezilikubitijugaw.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/29440340510.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/xafukebulumosoxafibegera.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jejalibuzojunikusofenenon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lois+smith+desperate+housewivesPDF 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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 10716 bytes
SHA-256: b75d30fafbdd211ba876b8ac0419924ed0a40bbfa4611885e634f2885dd31784
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 17892 bytes
SHA-256: 5c0855bbdb93928713e2db8b5b8a8044c3559136b32c14d415e26dcb07421078

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