Malicious PDF — malware analysis report

Static analysis result for SHA-256 6327d164ad6696dd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 09:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf77d7729e948ed10f5fb79a388b0649 SHA-1: 0cf8bc51a7b862552971e7e7795a3dd0e6781786 SHA-256: 6327d164ad6696dd4d7b5504c49e3fb661fbf7f07aeab62f77787bca8e167fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bulgankhangai.mn/userfiles/files/99280892042.pdf In PDF document text
    • http://area100impianti.it/userfiles/files/55443645975.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/epoujf0q0icnvdlsp61kji3hlq/famijusukurejemitagexuvo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fbd798920fdebab67605c3cfed659095/xafukaf.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/bonexemuvolimibizuxodewoz.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/tifisisigogufa.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/lejaleluz.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/1g5u3nberoe0hin886r32b0vrn/sukimovugitodi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5e8dfef12710e38a2b950c6573e9a5f1/36606435360.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6f7dc9bbf4c56ec1a990c28c3b06fdab/47873458845.pdfIn PDF document text
    • http://carszana.com/image/upload/File/1367407188.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zakemamowiruwexuberafuzuj.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/36424063463.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/26238180250.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/domasobev.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/setaxejunovo.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/47325088279.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/77596912012.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af65774f7db---xuxix.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/bolorofomoxivubozag.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/65ih3aimrm55v0602719pc04bd/32407448367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=750+mm+in+inchesPDF 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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 17920 bytes
SHA-256: d900940b5d031e95a70222df7b15624d8ccdcbd222f4864d44a3435d8d9a6bee
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 10180 bytes
SHA-256: a3bab5c4a701e9df3e826cc5ecc4aac5f2ac752ba8effb5abf7b7ab35dfc8d78