Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dffe0689000cd8…

MALICIOUS

PDF

73.8 KB Created: 2021-06-21 00:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c7392773d8939354f0dd8475a291c210 SHA-1: a00ad4fb5d0067945ca6e9d7fa92d94ce1c0bd10 SHA-256: a0dffe0689000cd863b83ca6c5cce4f78571feb8798e660d77d74061dc7bdae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://drentmedischadvies.nl/uploads/files/liselepivi.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/jetabotuvimugoviregopotum.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/30cead9ce73a0e3709e947f6daa67362/xuvivaviniluzijimev.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdupp5cr1c44os68gkpujm63h7/77706594613.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160883415179fc---xokumanodelibu.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/3941a3b9bf25930685fc641d3b853c6e/5689788679.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84794bc10---81303559947.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bnn0tuup9ga6445kujbp4at802/88199196057.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a932e26294aad9ed9857c363fbb5e210/15405007550.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/5297837554.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/uc4odqrcn9d3lo94o9mtgu4vd1/10669182923.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/da4fc4b6153862a4db7d35e39017f0b6/43325061052.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee9d4a156---digaxevibewesavumolupiv.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/laxipoporuzaxekuraxu.pdfIn PDF document text
    • http://axwelindia.com/uploads/42526560613.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b016c8e4c---mazabepuzofesa.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
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rahul+kumar+ka+ringtonePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 4876 bytes
SHA-256: ca9f7879145dc122aa2dbd576987c1d319a2609943aa124f58457374da126b8e
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 2024 bytes
SHA-256: 6edd2dc65f8cc0d4bfc465674af3a6957927c9580e196fa1f2ecab0bfce717d7
font_02_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 10820 bytes
SHA-256: ffd4e5b41e5d820988c0069ed9022f2c7e7ea7643c40699dd7a29845d3580388
font_03_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e