Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc6341b39928319…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 02:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25af2a0204a9abf119f31194fd3c4b98 SHA-1: 50a59e336af446c69f35a2fd71196fe02c808a1f SHA-256: fcc6341b3992831913912d089ad6ce069de0fd65e0c24a59771d1ef8051135de
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the extensive use of external links suggests the primary attack vector is user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=getapk+your+source+for+android+apps PDF link annotation
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/sofunepesufazisijapober.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/maxoragigukumap.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/86177158541.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/rofirimazutofoveg.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9b29e6ec9cf1eceeabab572ad2a4e4f/vilikan.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021092605014673499.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/logezazeril.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/zipibibepitodalixulubixu.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/3346291611.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/71629537166.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/kawogofalomatadugov.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gutimosedewokasumobima.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614731ee2065e---63899791078.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f618a33ca---25468478452.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/jadak.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139453f98ef9---jetoxopisoreges.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/7246416278.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96e9a6546---zovojajosidudivulupir.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/nunilewibejitodage.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/99965280562.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/57012825426.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/84134644872.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/63468911078.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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 15012 bytes
SHA-256: 783b4e9fdfdc2ae54a20a19c9fc15ccec50cd05030c2f266c63f3ddaf428d79b
font_01_sfnt_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 10912 bytes
SHA-256: 18f1d887fd143db7faa5bdb3c792a129b3a50fe8c656f1a92c17270362c3a542
font_02_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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