Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7e8347d6e38112…

MALICIOUS

PDF

91.6 KB Created: 2021-09-13 11:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1392bc1afee589e26eebbcc85d7161e3 SHA-1: a79f1ed1cd32b00688a01aaafaffc16771f89fa8 SHA-256: eb7e8347d6e381122ca6cae03d34a4254c598e3cb998d5fa00ad6a7704878f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=debug+android+key+hash+unity+empty PDF link annotation
    • http://rovitek.com/userfiles/file/37952457346.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613360504c173---1716833089.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/burubizuxakurenuguti.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/87791927506.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/86360002280.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efac8cbe0c---dedakuvubotu.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/belewadogajopa.pdfIn PDF document text
    • http://valserve.in/web/k/main_admin/ckfinder/userfiles/files/kixusikafuwigolod.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/84933289989.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/41157950656.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/26133516229.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/wofelabowaxuvuvuroboka.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/87406584440.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/69378827595.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/nunujorat.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/lurososegasuvimipowexoje.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zexajuxos.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/93141843232.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/44967735600.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/63f2a465614692f3dc97e5fdac3d5db5/2646729240.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/ratoteminirel.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/25859504059.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/xorejafazivurafinumituwow.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/59458291719.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/5872498964.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210908111700.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/15782361673.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_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 17380 bytes
SHA-256: a948d4a6346c710e31df48a00f50314ce8d07329f27edde823931fa6fb861a98
font_02_sfnt_off000146d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D5 11240 bytes
SHA-256: 778f61cf33fb7c18dfa7fb429452ee52fc5e3ea25665add762e6863759a32ff3