Malicious PDF — malware analysis report

Static analysis result for SHA-256 8578b5ec880ddf8e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 03:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a96651263ba3f982750563d931c89b1a SHA-1: 10d82653a53492bc193616c1ef7357c40dfdee85 SHA-256: 8578b5ec880ddf8ef4579679b15d7918bda632d1281c500d9f44a52042e93b93
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crysiq.ru/uplcv?utm_term=value+murder+mystery+2 PDF link annotation
    • http://thevalleytrader.com/files/12373531001.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96203726984.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/maruxatidaxununig.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/59356354144.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vagoximiziw.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/duronemamiwabusumato.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/sopabe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pgl9icuffg308lkajilli2bso1/jejobibaxewawoletojinuwu.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/volapomikesabuzoboluz.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/muzelufetojejus.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/bomepof.pdfIn PDF document text
    • https://qnzar.com/files/josibe.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/tololetakuzufopowigisuki.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354d6c69c4a---64029730779.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210902191907621484cdgmt.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/9776195165.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/wubilobixinapuwilatim.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/19938133302.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tavumunafixivenubunosiled.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/80871429219.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/12443743088.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924ab9e907---86544552225.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fogokirijobof.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/luzurovirenixusovodimob.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/86957614325.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/xusedufepuxa.pdfIn PDF document text
    • http://wwsm-us.com/files/file/34932688859.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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 16816 bytes
SHA-256: fc01d1485b7c901c49879141d3bd352d6e0a5ed4e8a36b9df57b32c701f2610c
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 10396 bytes
SHA-256: f70f75c1b02d4a490c48bb17eeaa30dd986bf254c5405fd2bd5dcfc34fddcbf9

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