Malicious PDF — malware analysis report

Static analysis result for SHA-256 774c5fbcf465095a…

MALICIOUS

PDF

87.5 KB Created: 2021-08-21 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 727f2e2a84abcb845ebc12d3afe2d918 SHA-1: d638af36029aeccd27daf67c9cc2f942f7d19b2e SHA-256: 774c5fbcf465095a36352cf1cf8b64f1affbcee7366636b048b8bf63f696e8d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850ddf2837a---53595937545.pdf In PDF document text
    • https://aurorabersinar2.com/contents//files/87362562811.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b253debea46---94832317115.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3lkuepbeullm7gk2n8kdulfa73/40682776512.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/negivevunadixivigobo.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/poson.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/3582295431.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/49255936861.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/niwebodibanip.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/63289109465.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/82668444304.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073582e077c8---96783616044.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/3131613783.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/mumonaxidajunu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/17105232402.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/dewudolonaxebiwuvaperukik.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/vuvusufivevusub.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/13784411114.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b39cce2772801bc4774ec1998da27638/modupuvivekixakizap.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/bumevulaxupeset.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/37cfdfa83164c4420e17d32e844d3542/38914645083.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d6feaa094ba212d5047ddf74272969e8/sejimudeku.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/2475127659.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b6eb9d627---76839655256.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f730858fce8---11468787881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=urdu+calligraphy+fonts+free+download+for+photoshopPDF 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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 11204 bytes
SHA-256: e607cb160b73759c7335cb5cdfa51b6c072758934cb23d60d13f2260cfd442a3
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 17176 bytes
SHA-256: 70e2845d049699a230fcd5bd28e6884092154a29cbfb5fa071a103f1c6eeb207
font_02_sfnt_off000136e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1