Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f9777b9cd8a849…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 00:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c63175edf0ee00f1c3c78aff98a1c8f SHA-1: 32bcabb9e969393649047c0340ee5c4cb60def9c SHA-256: d7f9777b9cd8a84988b4e780e4c5cee73a05be5339a09415337cbc07770f6550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The document's structure and the presence of multiple external URIs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 http://horizonpestservices.com/userfile/wojolamuzovafanakupoluzes.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/37273377629.pdf
    • http://massimobertoarchitetto.com/userfiles/files/xixilik.pdf
    • http://sakuragiramenandsushi.com/uploads/files/jirozapunapejanifati.pdf
    • http://maymaygiaydachidang.com/upload/files/63186024159.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210905165704.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ed8f9dc---zeburipudu.pdf
    • http://konakelektrik.com/userfiles/file/28661438815.pdf
    • https://koncnc.com/genelresimler/file/dugutonadebiwimobesuxo.pdf
    • http://www.huntsvillepr.com/files/files/76449294225.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0e1a7b08dde1eb9ce39d0406adb9b552/30824822857.pdf
    • http://e-restauracion.com/app/webroot/files/uploads/files/lajuwujodijademakopalimus.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8a338daba26e428c0eb03a98e3de04aa/19620149341.pdf
    • http://suamayin.biz/userfiles/file/samibifapasafebivisal.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lizom.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/sigejo.pdf
    • http://luckdidea.com/ckfinder/images_store/files/70415836912.pdf
    • http://cuboni.com/uploadfile/hong202109031617173117.pdf
    • http://pointerboards.com/uploads/admin/files/11985404208.pdf
    • http://potentialdesign.cn/userfiles/file/1631569122.pdf
    • http://cayxaotamphan.net/userfiles/image/file/legig.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/senagivajumuxotaxegiwum.pdf
    • http://sethhukumchandschool.com/userfiles/file/guzeweb.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/daganituzimu.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/lepaparodotenajefiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=insults+and+comebacks+for+all+occasions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 16792 bytes
font_01_sfnt_off0000e04b.bin
5d02f1b7e6353c8f0d2bd308ed9a2759a20a3bbaa51113eaf0986cd444a8b146
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16528 bytes
font_02_sfnt_off00010ab5.bin
4c99cd2f9b45c115dad98f088a9c1478a4ee4084f84715fb50f0ed24499d8c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 11064 bytes