Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aa205dc1bc2001…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 15:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a380d7e4616d89da1eabc0ec181de985 SHA-1: 5394dd2a673dc9ab330dd3e675e6d42ff3cf2b01 SHA-256: 53aa205dc1bc20015fca02d022eee9609fbcae5443642c7fc4bab0fda5485c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crownprolaw.cn/userfiles/Proj_Name/files/tuvuzoxaparogijax.pdf In PDF document text
    • http://insureacompany.com/userfiles/file/jutasegoduraguvotipafu.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/leponepafotudujikivu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610794f20cb7a---18542466721.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d5473fea69d8c5d5d9e3249e9b59d27f/kalitefeluda.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/66e950fcba9f768c83fd2082f58943ae/74268024918.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/72473618376.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lofoje.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987ec62ad18---rilesovadenexame.pdfIn PDF document text
    • https://efnnma.org/files/file/nefiturufi.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161177722e3d7e---vivekulusuneva.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075117530abd---44902236837.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nupew.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be10dc11ebb---42265957623.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160881c4048037---janugavirepu.pdfIn PDF document text
    • http://artospace.com/pics/file/59425027944.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/35894947226.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108090048207868.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f8e2604e0---65472537773.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/52683531593.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zutofodurexopunokikavi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7c8f8ab3141fc8027f52fa29c0984b16/mabufodoteriweru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dc+and+ac+analysis+of+differential+amplifierPDF 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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 18684 bytes
SHA-256: c6a564342841386cebe89214f419d0941e78c6783fed1eeae3a94f4702769e91
font_01_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 10896 bytes
SHA-256: bc59ce96dbe6b59fcbca443a27395f82f55f4afab52b10e7c68d97546b47c3d1

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