Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae06f45c97b22bd…

MALICIOUS

PDF

86.3 KB Created: 2021-08-11 19:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95e4bae721d5f098b003935283e2eb7d SHA-1: 2c284607741464b979192bdaa3e8bb205a5aa896 SHA-256: dae06f45c97b22bdf5547f2fe05917afac489eacd7cae3e2b4e51c56776bbadd
244 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating social engineering and malicious intent, including a 'ClickFix' heuristic suggesting direct command execution prompts and a 'Password-protected archive' lure. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, suggesting a distribution mechanism for further payloads. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://srub-servis.ru/userfiles/file/jipixu.pdf In PDF document text
    • http://ccsilver.kr/files/fckeditor/file/684622820610e4c77a2809.pdfIn PDF document text
    • https://digireg.cn/upload/vunexowomumexugimiseba.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6t3ak7231kgi8g107m1kmk7sg2/27779086775.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/27081379010.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/96484890184.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/71312353920.pdfIn PDF document text
    • http://planetamama.ru/files/file/loxanu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/68487310270.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vunelusobiw.pdfIn PDF document text
    • http://k1a.ru/images/files/file/latenudixenizovekibof.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8c1df6cc---71134184388.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2ab44052---5464407218.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/kekopif.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1b78b937---92888880189.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/42131953590.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/zizapobuwoz.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/93081533749.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/bebexevavodig.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202108file/2021080522544770554.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/sazafoxag.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16106d681e214b---85652078143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+hp+recovery+manager+windows+7+32+bitPDF 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 17332 bytes
SHA-256: 0c47d4e576721bdcff8746c5fd856e0e9f2a2bbd9b31f355f7a1911e80477ef2
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 11708 bytes
SHA-256: d710c78673de269e7913b708e393251eb04944d618b589d257b2f4dfa9e04b3b

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