Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a29f1cff2ced1dd…

MALICIOUS

PDF

71.0 KB Created: 2021-10-04 19:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 038443507a054dd358e640b6c2109d4c SHA-1: 911cc15196bd9a92d416007c3ac2a7d862e30026 SHA-256: 0a29f1cff2ced1dd8741a11923d4469a60a5a74816dae1771b4342915a3d2b23
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/23477122358.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/500eb72f78529c4f27dc327df4be1137/muzobelota.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/2655741029.pdfIn PDF document text
    • https://chv.vn/userfiles/file/39323377976.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/mujapasapedivude.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3286359110aa4edb7f3586d0adc6d320/temufupajas.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/83229696508.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/15187962000.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/gegomobibafur.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff85d0aa65---kusotolokusawukulorune.pdfIn PDF document text
    • https://ksuskalology.com/images/file/58486257684.pdfIn PDF document text
    • http://kraciowka.pl/userfiles/file/vaxinapelulodimitinikix.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/dowozur.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/bufasitoxukuda.pdfIn PDF document text
    • http://indemo.pl/Image/files/17158103045.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/2957772747.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93d92699c---rexolurab.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/61591365935.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/10104442008.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/89249182503.pdfIn PDF document text
    • http://matras-devison.com/upload/file/42386963331.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa57a66da---jopol.pdfIn PDF document text
    • http://candientuvibra.com/images/file/mofirekum.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158a562ea8b9---poduxupafobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+world+of+readingPDF 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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 10416 bytes
SHA-256: 7e7640840b02c9319ebcb3f567477c371edc6f87a191a24a9763d52240431c1c
font_02_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 15764 bytes
SHA-256: 987437ddcfb490b1caee551b044d141aa5734f904d8e13b0502e76423f21b13d

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