Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a11b028ef71764…

MALICIOUS

PDF

62.3 KB Created: 2021-09-07 10:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1f8da2d3c7d65a4fc0831e9ca007b78 SHA-1: 54ee18d9ce77567754977ca9483d7d6c13b104c1 SHA-256: c1a11b028ef717640f6472561fb10c73e6c1ea7712c8cebe9acc1af5d8d6fb61
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5680

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=ssas+2016+tutorial+pdf PDF link annotation
    • http://vasvaripalmuzeum.hu/upload/file/60268136143.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16117334b6cd26---31882504044.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/15549729859.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/32307110819.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jaxirowivebeli.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/90858052265.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jigijo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ae6d567c---kutirax.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021072711015373499.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zafasilelof.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pac67oemsr87q9tml6uqks3f23/resudogemu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/repobisezipo.pdfIn PDF document text
    • https://felicityokolo.com/file/1148807708.pdfIn PDF document text
    • https://infypos.cncmonitors.com/infyposcms/media/1810375862.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/tojaruzesozumisazefurile.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/44340689791.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367bd8682cb---sigavuxafegu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u2uk0677aij8b2756pnmjccce6/14593173172.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f689d19c0---wumaxipanexopuliwapiborol.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/5847975447.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc47d652d---lifisozinas.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f1a855bde---jaxubub.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/xijuzewagibidusivovebosib.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607968a4e70bb---kanulunotifotevirunug.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4003eff6c36fda57a91166315f0dbc0b/15595309377.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e9fb4eb06f9429057f5eb6938903371b/21216146365.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1