Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd4a267fdd14c7a…

MALICIOUS

PDF

83.2 KB Created: 2021-10-14 15:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1ae8f1e8a4186a2b2ba5b51dde96a3f SHA-1: b8e643f5a079de50fe2a15d666607a0591ba74eb SHA-256: 1bd4a267fdd14c7a1b7cff522f33c3d5a7b03670dda6297b586ddd6c4924ef78
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The heuristic firings indicate this PDF is a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=best+songs+for+adventure PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a6e88a16d0a2f9461e5a2fef9d969733/97968305246.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/70467882663.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-10-9/20211009015146566742.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee01590f85fdb0f346718a76137f3633/79888597987.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/84824402372.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/duwuzakixutobafuxidonunix.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/38b17f567beccf1e6857de457f2481d2/14932743491.pdfIn PDF document text
    • http://zgic.ru/!upload/files/jemabemikeguwuv.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/dodiriromedugeripos.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b5583539---22277569066.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lobagenolozorexakin.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/86345225935.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/97704455335.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd57ba0ce1---dejapirojikipir.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0f6328c60b68ed15ea1dd53ddb4aa8a6/10684659540.pdfIn PDF document text
    • http://qdjshg.com/files/file/1662328486.pdfIn PDF document text
    • http://abworder.com/uploads/files/zekizurepobukebet.pdfIn PDF document text
    • http://tyextractor.com/d/files/864682832.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/24471048077.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/36526535497.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/fajatexafaribapenida.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/bekat.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tuxirugezegen.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/15585992155.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/96451996732.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10608 bytes
SHA-256: 3932b4abc1c2a6155d425ade41c1376c9829b165b0bcca4af48482f03530d30d
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 19060 bytes
SHA-256: d1281a4d6bb4fec34538d38d34b785c8fe71d5e03a2ab018c9f83456e9c1c977