Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d68c211758ebfd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-04 16:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e96409eed37bb229c23c21b3f0756bf SHA-1: 0dbb7a0298b8bdafdea70997f6c3ea32e559660d SHA-256: 03d68c211758ebfd13e70ad20248035a4fb80a5b80b63a7e9c676282abf70aeb
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The presence of a 'password-protected archive lure' heuristic indicates the document may be part of a multi-stage attack designed to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=printable+spanish+worksheets+for+adults PDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/3o7hmjirul9e1retid1c0rlsb5/dikufiwelijedu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tomq27rdu2967j5si2jrnjh4mt/85910308335.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/8213650812.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67122269263.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/50446798014.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/mixaseramanabavesu.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/jogobewaneruxojoxaden.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/15951429817.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2c94324886f3a0e01bb4880504ea47a1/75046030539.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/4480022010.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/79071105543.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/xewazisuvadilerutu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/zapexidugewesudijefed.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160878d52bf808---41700424726.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a555224ee2---rilapojaxabib.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa911635de---tadijakagotidub.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fc90f106---77594556839.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/larosagebam.pdfIn PDF document text
    • https://norservis.com/files/files/83855590845.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/15155664760.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607454c0b555e---mekutujagire.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/gsvas5cknu9m3pnqp65u8d901v/pekagufubogojekivigasax.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/bupojejijuxowoto.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084187c87718---68167550992.pdfIn PDF document text
    • http://mesterek.net/tmp/97178526539.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_off0000b3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B6 11016 bytes
SHA-256: 5a3eb284fb348a679c3d44d957160dced7c5b70fbc1de5ac5d1e954368b94e3a
font_01_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 14364 bytes
SHA-256: 6c6722eb6dbf4bc83465a212c9e53355652b047005d1b02d3d4368178a1acc62

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