Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c51ea1a7b545f18…

MALICIOUS

PDF

94.2 KB Created: 2021-09-18 21:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15c0666bb4aa610137b995babbf138fb SHA-1: c65c086dc0625070ea14c58da461746752b65d56 SHA-256: 5c51ea1a7b545f182ac8ef0217a061c2f8356a6a9503cda03c868245674d5a53
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of urgency and download button lures further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://packturf.fr/files/bexaxufitowizovinar.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2193d3d75e782bc6e01e9fc5ba72a58b/24429511816.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/nopanupojo.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12958809821.pdfIn PDF document text
    • http://lagrupacio.cat/file/golexawijo.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/gaxidopo.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zasifirazewamidurutebavox.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96dd41257---95413252154.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/86722803996.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161320d73eb40f---88492460442.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zovolanijulixif.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/76297106057.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/gurulabasajasitobosujove.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/josibuvek.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/42905006832.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090913590273499.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/94971069207.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/9324933004.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b88enqds47kuk03h9toujjhv6g/pilupukunomiliduf.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n9ipohrqs1es36i4s8739jtv0e/85347757745.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/fobiwevexejur.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wodaw.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/72300313015.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/wezumoxegozupitopobiv.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/34058855083.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/xelaxikisinelutomamaxiju.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/nejuwopisov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minor+swing+chords+pdfPDF 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_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 10540 bytes
SHA-256: 82fa073ec32cd69f3ebcc86046d625d8fa56c63354254bd56a66c05032fc03bb
font_01_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 19624 bytes
SHA-256: 7d028102133eb96bca79bd3a2be4b71e41a3e5c16f09e89fb7bde0ab931a6562
font_02_sfnt_off00015318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1