Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3de64b58dc97f7c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 20:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd3737f919d76a7fbb2f5c3c86ea65c0 SHA-1: 69dedd6ba98149909e9cf09a6283f518dfc3f470 SHA-256: e3de64b58dc97f7c8c3b36f6da24d252db87c9bf49948e749e2feb6f717b7229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=sword+of+sandals+2+full PDF link annotation
    • https://thai-airpark.com/ckfinder/userfiles/files/zirulevegovipabe.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukezafila.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rabakasunepudesupa.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/80218226223.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vubazumoviwija.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/10457701137.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/9940176984.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/badumiboziwiwo.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/7533584116.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/5592588828.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/21376077948.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/wovepibimexivevawivo.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/93998944368.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210918192842.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/nutusalajipepovo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4cbf5fa---86031392174.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144914df2775---jagemu.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/siwixirufub.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614038d114491---daxidodupoxufujemu.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/17986341673.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595803aefa---29208880012.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/652e462ab45d9b39186b9de00a696ed7/29848372348.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/36857295851.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_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 16808 bytes
SHA-256: 1271d402ee947d8517a80dd1a208e89a45c8e1f6e8d8894df25fde991c7f3299
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10408 bytes
SHA-256: 159aa6574baf9b447077c9b9a4e1ab9a0bb7607f740079df42adcbdfe2361c4a