Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabd5b0b14438ce5…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 20:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45e0c5cade6aa1ff802147217947896f SHA-1: 1a10dc90b145467db5be57dff493acd8675e309d SHA-256: dabd5b0b14438ce5fc619056aa4295ee86fbe8fcab782a71271528a4882bf34e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate the download of a second-stage payload, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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://faprosid.com/file/vudozudibuturajawefiki.pdf In PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/dozopupemejutomafidinajup.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/91464043613.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/lojed.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c2e666160176a7c776f00cc56df351e1/nubaditikewajavifije.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f83b2a17390e2c2cae1eaeafacea2534/72298341330.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/fusenonavepiri.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f4488934a43a8eb83dc2a831f3993051/20418852460.pdfIn PDF document text
    • https://pecsikult.hu/files/file/funosezu.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/xagedizamij.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/83707196686.pdfIn PDF document text
    • http://clickvay.com/upload/files/96228314301.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/xaxavikuritiji.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/detoxavitijalikudi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c5dbe651---dukinefow.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/38454513507.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/73379100378.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80023240174.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66056a2282---81549437994.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/63916156189.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f4fbd8e8a61ea79ed3da93990af8e5f4/41138435811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=neet+pg+2019+result+pdf+name+wisePDF 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_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 11348 bytes
SHA-256: 43f1bf40d5212254640bfef8e1a9c1805b907897989a0d028eb6c5b716557af1
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 17952 bytes
SHA-256: f392be0975d144db258f80b65a9557720b020c63e49720e5c68b01011e8777d8

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