Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dd95a6f74601bd…

MALICIOUS

PDF

85.6 KB Created: 2021-08-31 22:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6684a05cd3cdd22bf421331e5fc35c3d SHA-1: 008ca48c7bac57ea5cf6745ac09b85edce65d5d2 SHA-256: 76dd95a6f74601bdeffe1acca1ee463c69d2892518455b4f0e1d43639f5a9436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869951c7204---49328794174.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794454ced9f---moxovodesukov.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/natobivafovoderawigiwok.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8869a9492c---55108283835.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8e971131ca84c0365aa27df2e874cb73/pagakozopapejo.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/5c535f90127b1138adb9e7a761daf222/tapuvutofomibat.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/75005757483.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/nozuju.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4b6cdd5cd53fc1ad79dccec0dcf71bad/losijulokasinevam.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/20441196870.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/tepawew.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6490aa44e---papirozuw.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/fazip.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/tusikosuxajafafemutapum.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0ecadc34---suwizevuwazixo.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zujomusaferi.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/filaludexavijarofute.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v3jhhdpevs8jbbu3lu687as2ha/risesivojimemivisew.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/rawevisulubona.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/beserevawegibuxenidi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/gunija.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab25a0ba6---telixogi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/92894615576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=proverbs+about+changePDF 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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10680 bytes
SHA-256: c276546187ab794e4029f1b2495dd537400f55534e4fff2c68379cd627f90739
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 17668 bytes
SHA-256: e41a31ecae5b396e1b981476d44a1261dd32d5c7a81a689218872f396873ad6f
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1