Malicious PDF — malware analysis report

Static analysis result for SHA-256 553e0e5c4b462c25…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 04:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bc158ba9987f390e65fb6d5a113d1a6 SHA-1: 43c7f0df297cf6c57e48cbf8a144742c5b1ee577 SHA-256: 553e0e5c4b462c251a934c9622896373f2f3f99855a082b3256ec80a5b8f28f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=informative+apps+for+android PDF link annotation
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/zivimowibojirozekevamus.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/68107053916.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/babonadapose.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/sozalevokadujalivarejud.pdfIn PDF document text
    • https://sambelteri.com/contents/files/79016749365.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/59224228681.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/11681614613.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/49287188756.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/90864664213.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/zidobeduze.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd16581e59---72063801502.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5de627487bafe12932388fd66548a5c9/pizajukobap.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/78248958830.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/fajiketezavakuxabo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/59528619061.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/79792366106.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/xevuneji.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89d5ca84a---60014284657.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/xorepakexiti.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109251251532793.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/tapefawevitujezo.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/jotijorulipaloj.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lafojozutiwudiba.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/80106497323.pdfIn PDF document text
    • 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_off0000af5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5A 15124 bytes
SHA-256: 61f5e5df82950057f27f7aecaf04c0c24fbe60bae9c28191fdfe36d59912d29a
font_01_sfnt_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 10632 bytes
SHA-256: c566fecb4268e152871c0f74e84078adece9256c36bb295720018898e11a04f1