Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4abe8c3b6379555…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 02:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ca7b174e27c21b4bf555dfca703cc740 SHA-1: 2198e9890ada0b6a97029be17f1392c02be9bc6a SHA-256: c4abe8c3b63795558c46b76460bae76e78de3859e44a72b7b4dca4fe0ae60920
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fizjoactiv.eu/Upload/file/62076877598.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/75ec0f1a2de3baa1ff2545c006f776f8/3299038371.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61c0725458---nukagowareju.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/kijerowu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af59a45961a---vokigojafonizufa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a095e0008f---bobuduzu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/12888465572.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/17000075211.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/jaboditudemorodoxitaten.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210710104951.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132687b54a83---dojukijuw.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210801_80A0F2B781DE1C2B.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820580505b1---rofolutajitidosanajegob.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8f954f191d82ea7a5e3fb63b18f339e/senagonadamobusi.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/62233898745.pdfIn PDF document text
    • https://loyd.rs/images/file/wituxuzesirisenagujejivof.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/feliliduniwajevapelufodu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/01cc358b14fa97cc5613f83ca9c190f8/49252150848.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/25475442372.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/38656528133.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/603c008842e96e950cda55bd290eecb2/pajituriwurinaludut.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/gudizujiluwusipakofere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=u+r+mine+novel+pdf+downloadPDF 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_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 17292 bytes
SHA-256: 5fc74229879a49264346063e250169a46c1503288913cd13b94317b908865300
font_02_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 10552 bytes
SHA-256: 3c1276743e9e36f15936f9399868b653a05cf158cbbec34fa091b1307268444b