Malicious PDF — malware analysis report

Static analysis result for SHA-256 8463ffdaf08d2cf0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 00:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7c19870d564a4c9bd5ea7d552ba4df3 SHA-1: f31b3263d56a09e375413f61d9ee22e658e1dbd8 SHA-256: 8463ffdaf08d2cf01a12ce096abec7917217ed59a526b075399611a606d37cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klimatyzacjaradom.pl/userfiles/file/penabivefov.pdf In PDF document text
    • https://tkquiz.com/userfiles/file/38331782755.pdfIn PDF document text
    • http://briztravel.com/upload/files/98270866231.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/lilafesoz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb0a45e25---foxegepanugugujefinad.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/40063714934.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/pifebonamigofiletotoduwo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139863fed32a---22651027643.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/25287869426.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jejurerugalezogi.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/22365434651.pdfIn PDF document text
    • http://a899.net/userfiles/file/xobimafubesusakap.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d3e854f---43237747972.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/togubirotadelu.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/folebidiwiditabujijo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/nusokurimitadotadaz.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/ronuzajetufusefa.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/43541570775.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/5105373664.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r0sjpamhvkqd3i59a3ucvpmpk6/61751165595.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/45e570d979df441effa2fe01b2f0f2a9/palasuwowulow.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/xudomuwiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cool+things+to+do+in+your+minecraft+worldPDF 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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 11252 bytes
SHA-256: 76ba186a068d6106c297972991dc310005601eac8fe23557d024684159762d8f
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 17700 bytes
SHA-256: 2532f77d78baaed4674e3dc316d705f73e2f56ce61b5853337df5d363727e50c