Malicious PDF — malware analysis report

Static analysis result for SHA-256 19540709780f879b…

MALICIOUS

PDF

79.7 KB Created: 2021-06-12 10:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5595868232974a60758ec3850c882972 SHA-1: 4c9b9d948b3745402854787bbfb2cbc420c128f8 SHA-256: 19540709780f879b9186aef331a711b8c56c9634bca2a517c90d3f4010a2b307
204 Risk Score

Malware Insights

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

The PDF contains multiple links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for malware distribution. The presence of a 'download button' lure and password protection instructions further indicates an attempt to trick the user into downloading a malicious payload, likely disguised as a game installer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 https://laborke.ru/uplcv?utm_term=need+for+speed+hot+pursuit+setup+exe PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/rugomev.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/22110100289.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cddf2559---petivifoduvinoxesixis.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g2iv81au0ef3vifh4c766lam15/tolupinojosakezumitilu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d09d21118---25698532726.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/86998018241.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/61301508704.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501104811142.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/68089215129.pdfIn PDF document text
    • http://djpress.pl/Image/files/88228938246.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3870930jsuovguug49dr2if4s1/dojibixujususedukuwovaw.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701bead0fc9---98449149830.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/rerisarigejanexuwota.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ecf80b546a6f13857c0248959267cfb9/75621256964.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7dbc4d2f---vowasufagedononobofogawan.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e269da70cd6cdfe5571c3ea87df19032/nubusiligugipitenugegig.pdfIn PDF document text
    • http://contactconfiance.com/files/files/35168088873.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/26sqc7pv8bqf36fvpr886fum5b/2946794186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 4700 bytes
SHA-256: 29ab0895f8054db09cf779fe5f9471ed5e8a77937d711dc9a601422946e211c0
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 11420 bytes
SHA-256: ad091a116d768e3d8d7179f45a155fd11ba53a2ab1a22d14e4935609a42616e7
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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