Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a43b08e341d527…

MALICIOUS

PDF

83.7 KB Created: 2021-08-02 16:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 685c9335a53b1d2b2ae5555780d73eec SHA-1: 9961e276cae1e0611523ea7459f1b00fd62f7651 SHA-256: 53a43b08e341d527ae73d10a393917c7057730bd7647562c2fb243f2c59798b2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9bi9lmjgcvhs9oo4m9u2c1oov6/23730791450.pdf In PDF document text
    • https://lawina-radom.pl/files/file/ferulagexev.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/bozovobinixen.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/29350257310.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/zupegez.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a2010cbb0d04f48c79372b949d11db2f/fasebo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7f1bd7f2---6375336379.pdfIn PDF document text
    • http://timapools.com/uploads/files/likivuxikuse.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/89126055667.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/timutetabagugikukofabur.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/738071db56b0c1786f287a0ef41d3766/kokenaminizewijajimegi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed878d2a9e2d2f10300c0e094d7274e9/mukogedepozomudogadi.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/630pp46cnsb7f2b9l554lhhdq7/98687595071.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f0c5b7885---nanitutabifubajowa.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/46338451871.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210621_27C1BD45616CC881.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/bumodojomoxemixurakubav.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/31821406317.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd84e4e5598e0aaefcadb993a155449c/dikaxuvotawakemuliziv.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7203a3f527---49561191097.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tafijuxitikavukima.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kulopodewofakanemu.pdfIn PDF document text
    • https://maviet.vn/upload/files/vibodemoxunaxumozobonukuz.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e4a955c4a4debc78391adf5a566bc72e/32352011360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+raina+telgemeier+phone+numberPDF 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_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 16524 bytes
SHA-256: 1f4f9bebcd0e4e1df6a5b0db7c3830c809abb97b950cc81b373d8e61e76e4a8f
font_01_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 10932 bytes
SHA-256: dabf603040544f810c8f6453a8d11c9eac2cfc8609652ce1d712f54659cfde3c
font_02_sfnt_off000127f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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