Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52cbfcc5cc1da35…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 09:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26deae8f50f335541353e76b86d6520b SHA-1: 1d7876c7722545657bbb79a509f55ffa6a756eeb SHA-256: a52cbfcc5cc1da3531c1c3d84faf9fc8417507a21d75359572dde93a0ab8ceef
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. This suggests the PDF is designed to trick users into running arbitrary code, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jakspravnenapsa.cz/userfiles/file/bonuzidojigenuxode.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ofghod7minfeiks4uq9k03tb7j/63851662574.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/7812987319.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/75978324103.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d3825f6d---98214544297.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/jasisalekuzu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/pinososoxofifugudonar.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/5872207368.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fa02a19a36b76f930cf1da43bc6db7da/30299967068.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mavon.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d534974---vunabusapatofirolesax.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/53190454761.pdfIn PDF document text
    • http://safetypath.net/cms_images/26700470981.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6shofh2oqjqfmlr3r5oi61c0hb/balugatexu.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/jetifidejipunumi.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/34773127261.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2b305633---tediwobifoxanixizagut.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/49903971374.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/dukofofuxedofa.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/bukotajabi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c22772c9---gokubobazubigano.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921a38b6165---lazesotusupivinibube.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/58170725512.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/polenerodaduwitetirolo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/igenbdtnns19ajrmo87g50q8ep/botix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=comment+transformer+image+en+pdfPDF 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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 17864 bytes
SHA-256: 81764111617397da8ac4b36a3cb86157377b0f6f603ecf5241379167716d3b67
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 10828 bytes
SHA-256: cd18bdeef4751981d3c7830692e691852affbcefbef73f94472c3a943f96e5dc

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