Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba1a9eceef227d8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 01:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 808c6f45968ee69ed6053133735acbee SHA-1: 5d94f6425a47ff2358d6dd4844c39bc521882b0b SHA-256: 7ba1a9eceef227d8b5e6742b382509038b47587a4e7fdf3642f7ecc936559e13
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, suggesting it's part of a link farm designed to distribute malware or phish users. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=locus+map+pro+apk+crack PDF link annotation
    • http://cudicio.it/images/file/98968393064.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/tokepatipefudonebepiri.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614971c6a5032---tajibuzejig.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/70445100697.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/51463204544.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xired.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/najexaxogebofegilaraxov.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/96774767489.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/pubazotepubatebutefag.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/48283207688.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2lo4vilc2f21b2a9vfa2dlqq6d/xatamogisovubifaz.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/25599181076.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/84058046867.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/gevugolevova.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/38c60573ef8d36dcfab01c42a78a56be/32595197295.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/16104180180.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109062032016179.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/61817854629.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/66553730034.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/32327545568.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kukivesawewanawukake.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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 19636 bytes
SHA-256: e19408e4494bccf5bda3b601f9296a9c388cc73af4b1369db445b8f70e774d97
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10212 bytes
SHA-256: 8176b5b51361d50c875cbfaa439940bdaa92c262bf7bb8432b3285d46701789b

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