Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcc3c2442b2745a…

MALICIOUS

PDF

79.0 KB Created: 2021-07-18 01:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a63d6bc0940d98ec50422f233d22589 SHA-1: 0f1ad0aac6c0f7dd248df017a01856f4cb6f1c5a SHA-256: 6bcc3c2442b2745ac19f2ab65376964d996df3f24264c992c654d16497ca573a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6659

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
  • 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 https://palcev.ru/userfiles/file/jegijiwumoriraja.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5a4b4df6fe50f1568483a7f608a1959c/lorofi.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/98649967800.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16081315cdf41d---15961045173.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/sinozadosexopi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/80250172427.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/37312992198.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/ninowoxakelaletijate.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162220779335.pdfIn PDF document text
    • https://digicpictures.com/downloads/gizusewis.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r9bep4khvpdro9tt805fp10n60/82134391352.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9022630b72---82654163222.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/59934393017.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fcc706f1---rebedukubamavedu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/jopegizedagipirati.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pokekabefixegik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f81f411c---18217101698.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/68be8a3618bcf2a18bcac5e4792990e9/pokukajoxopitemexowiruf.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/51nngsin1d3mtbkelok7knsvcb/bizoxinomosubena.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b61a10128bc---lidepavirezasovux.pdfIn PDF document text
    • https://siroyensao.com/upload/files/duxuzupita.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/limatexakova.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81910560f6---bagaxiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=city+of+troy+zoningPDF 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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 10088 bytes
SHA-256: 6f23b6edf493e0203995bdc32992f46d2a588dbaf09f2feb073b72a9fdab33c2
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 17220 bytes
SHA-256: 6ab3f6c989979facd5914f33ed81df7c52f9f786d91cdf8f7a5b6a3b84e0ea16
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1