Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b46488a92400804…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 21:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30801b2d3b17b762a023074f6f41ac49 SHA-1: 4c48d88ef7b495ecaef19b4fe827ba1798afa202 SHA-256: 9b46488a924008045ca95b17427b539d63cfa23ad8c6fb79466282edc4e71741
126 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 appear to be hosted on compromised or disposable domains, indicating a link farm or redirection scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', suggesting a malicious intent behind these links, likely to lead users to phishing pages or further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3549

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mclarenquartz.in/ci/userfiles/files/67622933844.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zunaneburexowuborawovalu.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/82017064827.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161216a68032b2---21883560337.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/50585959977.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kaxonudalesiragodiwadilet.pdfIn PDF document text
    • http://feniks9.ru/ckfinder/userfiles/files/jufibutexud.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zofibedurovajesi.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fa40c7c996d114bbdc847ee48858d54f/73414184656.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910b4885326---72736737837.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/tuzuzaso.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/71813633638.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e42bb626785e64afb471065bfc00a447/gupegozevewep.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/faseruv.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6c7f60424---zowag.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090471f3fe2b---tikabapogap.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/693c8533d7312234d4e04fa3375d6bad/wimoxis.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/23702905468.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/15476924371.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/33521808372.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0d17f548538d60fbcde6510434f99cfa/38930483038.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/54694293051.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/67555736155.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/32914579645.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/91701600426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=peugeot+206+cc+manual+bookPDF link annotation
    • 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_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 17916 bytes
SHA-256: 67710cb872164f9e41980f809545de76f1b6efdf8b29aa4c0d7e6173468be81d
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 10956 bytes
SHA-256: 5e975fd7492158497d52694f2c5183cbb65003eaf60caeaeee52091fb3f0dfbd
font_02_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1