Malicious PDF — malware analysis report

Static analysis result for SHA-256 849ad7bcc1cdcbbb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 08:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c42b6e8df6ab5c6872044a7ad588b4c SHA-1: dde39760834c2f69d39e1c83257dbd83708ec661 SHA-256: 849ad7bcc1cdcbbbe0974c29246a49755bd83f2bc51e59b5cfb3678065b82545
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a password-protected archive lure. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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
  • 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://smidgel.ru/uplcv?utm_term=it+all+comes+back+to+you+farah+naz+rishi+pdf PDF link annotation
    • http://turchifiltri.com/userfiles/files/85679374439.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/15318908923.pdfIn PDF document text
    • http://identik.hu/editor_up/60926917214.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/manajikiviwinajemabobova.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/55524446.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/91121751202.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dn17pv9fujfshkc2g6au30cslc/mozojopaderoxobofafobabe.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/fariponumax.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jizonataredika.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/18jien8kd2sn4edkmsj8gkkdbv/gorodilejono.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/54996267567.pdfIn PDF document text
    • http://fruitvita.com/files/files/gesepedelo.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/20350736346.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/mokikoxavofevekuw.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/20300238590.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/43256362805.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/74187057300.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/wedez.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/laxoki.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/5830527464.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/85438637969.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/20639425208.pdfIn PDF document text
    • http://drironcat.com/images/file/89409409890.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306cbc46810---lumowete.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/92186159439.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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 11340 bytes
SHA-256: fc0ed1d3a6143f1b2439e52dbba579b3cdea8f941888cac046ca7cf561a11dc5
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 19592 bytes
SHA-256: 64a05cb1e78e3da75c42db5bcb6c0ff27ec1a1b6e3bc876559b1e3cbc0aa30ab
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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