Malicious PDF — malware analysis report

Static analysis result for SHA-256 8531189fa36a7ae8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 19:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d00e99e4e897c4dcf3d4bcc311609359 SHA-1: 703e2fb4f945a55743b66dd7f05cd5b6ce829795 SHA-256: 8531189fa36a7ae886d4178089443bbfd0af7aa0ce3113d1c241b2cbfec09066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6ad71031---foruvefufuki.pdf In PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/28179863987.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/mlipb9tncnr2qa8e3f0e3pv94v/jufozilisifumoz.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/xifaputenunuvusoladamigop.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/turotipewifi.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3trkkia5jb05e8v3ra729chth6/57540250886.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/90038116165.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/wapetuwulekesoferurit.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a04184d15e4---nuxitowe.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/lirelumokunoledekurad.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/worogu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/migoxifobuzojemopunej.pdfIn PDF document text
    • http://altus.pl/userfiles/file/38105956529.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/19904810edf18715e44915cf0da94c83/90691554382.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160819a308dcac---mupisatonojube.pdfIn PDF document text
    • http://c-amc.com/upload/files/88346979889.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/gunijal.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/razakolekoromomuvi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bd69df951f5---73050028138.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/bisijetivaka.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3aca292f---90119773105.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/gafolenatavatolovab.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/dakivekobaxebudubowajiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sinusitis+aguda+tratamiento+pdfPDF 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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 18380 bytes
SHA-256: 030d8453201cce1e744f6d9ed0c5186b7385a912269dd95ce5d8a6ba0b42d2ee
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10968 bytes
SHA-256: 2e7489c2706d3006bd1ea87f0b09f60a2d821544b2c04c0e8092843787849075

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