Malicious PDF — malware analysis report

Static analysis result for SHA-256 67163eded014f58a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 08:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c1767ab966b06ad2a8dd9cea6818bcd SHA-1: 82fcbd14474b0b88e71beb552a18c09d3727fda8 SHA-256: 67163eded014f58a2f5d5b86ddd9eb0d0767f5e4a4f108f8a4626edf651278f2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, directing users to various external domains, some of which are hosted on compromised CMS upload storage. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

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 http://archinfo.ru/uploads/file/pededekiwukopemixi.pdf In PDF document text
    • http://unseretochter.ch/images/file/vewiz.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/niselosin.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7486cb0f42---25428137431.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078b10ae94e0---sisofibulizixawit.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/konutujar.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/riliramodexik.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zokato.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/nasuva.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/sigonagupuvewalotasop.pdfIn PDF document text
    • https://abeess.com/userfiles/file/90393521098.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4622791c5---25238334943.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a77004392bc---88651119435.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/1336265509.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/99684526369.pdfIn PDF document text
    • https://hgb.se/filer/file/80340030329.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ca6ee858---doxirotazemazadesivifap.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rhgr2knuhogj81q1n7jtmpafc3/kasamibujuvumejejezuxo.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gurafajikubokelek.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/zunovimuzexuzuzi.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/pamuxulomuvidigamak.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3077a1f261---69585863903.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0f794302---foguviwozexon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wow+cataclysm+tailoring+guidePDF 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_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16916 bytes
SHA-256: c303106cfab15a348560d6d5ff53036c46ceb4ddd81a2a27c7af687a4cd43cde
font_01_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 11004 bytes
SHA-256: 2564a0886a13f13a037bef7cd766599f8346264c25fd6024bff8b2da2997086b

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