Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ede109e9e2f1697…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 19:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4bcc8bd108dd72fc7276f4f9f544d51 SHA-1: 9c874371d1850ff6f771e9eb01be50689de69c0f SHA-256: 9ede109e9e2f16976688da3fee2a4739d086981781c3a37e65298f41024c1fdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL findings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=class+12+ncert+book+chemistry+pdf PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924fbc907bb---wimibafamurusiwen.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/kugetite.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/sanegife.pdfIn PDF document text
    • http://ailizia.com/userfiles/91386936355.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a733b00d57---2876714238.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a5a45cdb704a2cb2d398e02307ac4dd/getewixekoni.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c64cbdce---pigatukolojebupubab.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/vuzogopebisiwum.pdfIn PDF document text
    • https://afayl.com/userfiles/file/japujefu.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/suzipefefetukipajo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092607f608d7---jebimidu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608311b18cd65---28552740783.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/69c5d7d15a63c302956b929d3b894bc0/6446425635.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbc978f396---votumenodonixawiwu.pdfIn PDF document text
    • http://elskenecologie.nl/files/48912774841.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc8f58c0b---31516042681.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vezulanogufukikizaluf.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/27283028359.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2872c7a1---kalemo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fc2b48e7---63803610366.pdfIn PDF document text
    • https://micsys.in/userfiles/file/67011997068.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/naxutevoxakuvuxuferuxe.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c95ce481c236d0abdb49e685d7028816/dapejulebidanemubuworadu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/tuvexebub.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/9194293804.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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 11432 bytes
SHA-256: c97c2374830255f862350875a9e613ce3f86abb305cd4802f99dd3abfe99775e
font_02_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 18196 bytes
SHA-256: 24fcc193aa179cf8c59d4c27e608563721c2131b26e3f26db6cd1dc12d900700

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