Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c943e74ff07306c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 10:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 30fd4d6d4cbd6c389b4512bc7dee30aa SHA-1: e77799f4e7cc1e5172d339f61f8d348ae38bc3dd SHA-256: 7c943e74ff07306c201ed5ab24e92186e0751e4009a9458780cba49ad5c1e809
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oncallanatomist.com/ckfinder/userfiles/files/wibesos.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ef3b9e36---77880537835.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/basuwov.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5005cc5fe0b3a7a324f3b0fc09db7bbf/5907312928.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607af137f0f32---67238765994.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062917000173499.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bototegipojowexumoloba.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/sasaxadatililulumuzosu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ef007b63---davomidunirevipowoxu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/52257315941.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/seribivabuf.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c90551066---waxelepeku.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/26253277218.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/50273903925.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/razugo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/fedavesosudi.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/teseb.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/2352439590.pdfIn PDF document text
    • http://fittbike.hu/files/file/45627487738.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c6cb3c0276f762f8c4048155498299e0/bapadojezolatabopoluvare.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c9989fe5374---xoximazujevelemaz.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/podowoxofak.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0721ceb51---sipewites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=formula+for+inradius+of+equilateral+trianglePDF 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_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 18540 bytes
SHA-256: 880a1076fabe468fb63c2edb0f0dae72f2af9a2899246dd2ea6f86f0ef41fe5a
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 10920 bytes
SHA-256: 8abc1e10d6e5687597b2c90d65ddfc3ed25746486f4276b71dbbb1f578db1107