Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a91c3a1d7e9ec78…

MALICIOUS

PDF

62.3 KB Created: 2021-09-04 11:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8eb5082bcc6ca32ddac17a2377585da SHA-1: e270cfd48da472fec83c2cc3349c24a9ae1ed06e SHA-256: 1a91c3a1d7e9ec78b63a57b39741b306a3d1c018ebd1b2cbe9f11744e82f1245
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns suggest a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://nomylo.ru/uplcv?utm_term=2016+kia+sorento+lx+owners+manual PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9122925f---38498609411.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/woxiwepemokagegipemog.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/87130174368.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/1840713576.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/luzokobafodeponij.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fuxabujubimomikisi.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/losulutuwinupojexidaru.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/25428981982.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/tewav.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/oglnfnie7i6fp3693b5t2k5ih7/boxiwatugidevanusi.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/24203039991.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/fezekojidodata.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1aaa1f1f---lujubevelesasep.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea083479d1---7877136941.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2cb1203f---robepazedawezumalebixite.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/trcnkerb8vj4tt91oulc871s82/ziratovuriditumatujato.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/993e06eab8365a0617c68dc1ae0afb20/85879028884.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/58f48f200b3c5b316b66ad8ec2506543/zapuvu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c894bfe8---34620506947.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/vedilumadaxunefona.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5heu3bnjcecqsk190a187etair/52931353551.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/17571988677.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/kamogo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf46457498b67f9fcf3639b631f41c22/37373073506.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_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 17240 bytes
SHA-256: 06049b65a661aa60944b9123c7196d1c76f659ee4e45036a46dac14c8391325f

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