Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b26a4eee3884cb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 16:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 596da972b5ed69c924f57a313885ff3c SHA-1: 1fa13e88422c63ac9cf9e466ed6df0c14aca00c0 SHA-256: e6b26a4eee3884cbeb8bb4682c5bb9ac425c5e1ad8dc97c5314a0b20d97bd464
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/g4dbpcfk0skpiusi3269vgsde2/vebozudexopokum.pdf In PDF document text
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdfIn PDF document text
    • https://bloc-immo.com/images/53988901312.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/pefaxabemedabisafugowel.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/janabedavexafalumi.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/51311016363.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/19416750678.pdfIn PDF document text
    • http://msiutilities.biz/documents/kifoveleso.pdfIn PDF document text
    • http://sjanzee.nl/file/34443174860.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/39920762644.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/10786292157.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/duxetuniboguxafabadefix.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/37259430895.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f4831b18---jexif.pdfIn PDF document text
    • http://15881588.com/ckupload/files/winutixibajo.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/sokibalinajodetag.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/71477439398.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8hesug1jn9fe1k48au70bd5s3f/79262172449.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/digow.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/ruzibu.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/dotezoniwibipozulurag.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/mogakebelogepuwekozikomas.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/gutibesenujoluwafoxi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908024725510131.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/12760165387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=murach%27s+c%23+2015+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_off0000bde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE7 9864 bytes
SHA-256: e47e0d9aa18e27c5b04b61da7c08fdde4395d60dcf8a6e915a64f0acc9d57b20
font_01_sfnt_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 17500 bytes
SHA-256: 688fb0836eb69afeedee3adfe5bc9dd1135ed18f6a2edcc833fa82642c9344ab