Malicious PDF — malware analysis report

Static analysis result for SHA-256 534b9610ab420e3f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 15:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f5eeb77d804eb6e18a397f0c2d5e5a7c SHA-1: 3206089162730e43cf1caa54eb9fb6421e457494 SHA-256: 534b9610ab420e3ff9de382d05f08d83053c9cf8c9f117abf825023c02d9fa35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various URLs, some of which are hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phish for information. The document body is unreadable, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/05103a5788f8c5b0a98fd16d3b4d471b/21803747729.pdf In PDF document text
    • https://unibel.pl/pliki/upload/file/baforuzuremeterofixupiva.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac922dd26e---dilaguma.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/lubadakona.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59270518110.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090510143173499.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/lasuzajoxorovudube.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910093622.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/73622856114.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/54017146971.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/45536255861.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/11083479507.pdfIn PDF document text
    • http://ubest.ru/images/file/zakomidemokavosuzidadobe.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/depobisosokigesodejak.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/wipadi.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/nesasapajuz.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/62051134390.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/luvilapuretonadexa.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/39133123065.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f9ac04e1dad5dc98f9b0369042c188cf/wadazepabuwagimejogodojor.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/nokakajosixametesigadipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bahubali+2+1080p+bluray+downloadPDF 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_off0000ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4B 11088 bytes
SHA-256: 3ab049864395f48fe4700b44f4069f73c8b57a6ed4ab6b6076752026ed259398
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 16716 bytes
SHA-256: 409a0e8a33e06cf0bd3a15b3bc31a9451cb54669dba46a0a76ce38684dad8a84