Malicious PDF — malware analysis report

Static analysis result for SHA-256 7908aa57a9ba74af…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8da0f2d59a2f96644fdd3f72f1fc606e SHA-1: dd912762be2bab87a1245df10fc9f39753fccfe0 SHA-256: 7908aa57a9ba74af77cb22de36350076be54ed815c48f59773011ad38df9da0e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the primary attack vector is directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614513c23037d---61369026008.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/10778397428.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/11628171216.pdfIn PDF document text
    • http://epmachine.ru/d/files/63177116072.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/9275906309.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/74866567339.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/nogujokexusijejagip.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rabasadikota.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/31821391799.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/roxovarejinenomifirovat.pdfIn PDF document text
    • http://autovoda.ru/upload/files/22945257990.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zinoxajabi.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/wikesofimojotemixugizebi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137deca2a974---vojeluxorejibapuv.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/sigakopijejasolotud.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/48769786049.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/81505815334.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614919dbece30---56758103536.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qpqtarnel01jedakthulkof0be/jatetomozamolirefor.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/podinarobulepukas.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/16447754859.pdfIn PDF document text
    • http://meditopthailand.com/file/newoviropawog.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523b37a40ba---41193056164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+app+for+watching+movies+for+freePDF 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_off0000aefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFA 14540 bytes
SHA-256: 75062852495f0547513bfad4f1fabde2008dca02824353913f2306f013a14dde
font_01_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 11084 bytes
SHA-256: 0b89f1444c544ef0b74ff5c5edc1ba8a5c5d2f2cb86917cb1cbc9ee271405522

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