Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce79a18a7d0bccf0…

MALICIOUS

PDF

91.4 KB Created: 2021-07-22 14:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d1b0d79b429946f4009561558783b70 SHA-1: f4e86cbe68ee66f7ea12a2d9869c80d09ccb02a0 SHA-256: ce79a18a7d0bccf0a99a06337221763f13cb29ecc23f4a5be6427a146e4c05eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The file's structure as a link farm on disposable hosting further supports a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maasmartcity.com/userfiles/file/nojur.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf17ee3db---xanotasitigev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fdfa50c07---4377693806.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4e8e872d---24932272331.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/b50a98ca38dc866fad2edd8d9a134020/gikisavike.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/50062536897.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dagobeb.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f5f1e26c8f4239ec3488061ca80fc006/82592106362.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/431acf6fc5a479d63002333fb00870bb/26616038667.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c984111d16---71425157817.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2eefb90bd0ea524a7f2e44d3fe7d0871/rajevavuwefewabene.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7ec296d656c8a1013828064e18187434/56254081394.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b990d2a238b---pevumuvawewekigovegasofol.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/31448723685.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/802d1c1faa9e0ee7bcc436d3e5c0926d/dojonekurifatoradut.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160875f18bab5c---54429408504.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2gkj8lnvjnhsd0ef6t22jueini/35673890581.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcea99a46---kopolaforijuware.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/dugmr2sdmef4esn1qjlndo3m0f/46930664282.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/tilojefozawelumet.pdfIn PDF document text
    • http://poorclarescork.ie/images/nexogasomuvugovinumikevo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/32843466478.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vumagunogaposojeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=td+vaccine+full+formPDF 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_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 17580 bytes
SHA-256: 118be565707ed3bb3ca50c637ee136b4b99ae42310a5a69f19fc70820ac03302
font_02_sfnt_off00014831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14831 10500 bytes
SHA-256: 22820de0e491c1e2ab9d792b1b20d36a0668394c069512475476fd8f391d5e99

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