Malicious PDF — malware analysis report

Static analysis result for SHA-256 716c975b04f62c7d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 17:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ca4a3314f954c7bd6a3fbbbc78260ce SHA-1: 949aec78c675afcd5e450ba1ffb0140b2632a9c7 SHA-256: 716c975b04f62c7d573361b45190de473adb35a73a48102367a457fff184e1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/xezipozadesit.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0c987247---rurexobavixatu.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/barbvulcjan7vdti939nafhgk6/7836684642.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/feaf16acef13bfbdba039e6854cd3f6e/sazavabudaf.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uo4u818cnqi7qfuu6rk3koejd4/87776445935.pdf
    • http://el-master.ru/userfiles/file/60095974144.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/bijuf.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/65938403602.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/610e52899c0a1ca28faeb31adeebff17/vutitasojevegoziva.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87b4415a6c---36447878911.pdf
    • http://10glazsikeyrosa.ru/file/rawigirejenixesopan.pdf
    • https://angkoronetour.com/userfiles/file/38218061822.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777eb6ad3d2---zapagavebuvegi.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609857ff504da---junijuluwodejogepurag.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6455abb9---sewilivutirijikotakevomix.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2bqjbidv85g0rp6o8imntjl9f7/72283524006.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e002eeaf09910499359a2dfb25334a95/15705826626.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/78307051900.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6aec3a29ad12080420819922493fb353/bopupedobikuxofugujawowan.pdf
    • http://bannhuaduong.net/upload/files/jawewarejaduwujapu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a327015281---50294750211.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b76203c51b8ebc3e7b219a8fd5bbab49/41423027507.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080aef2ef977---lozaworidowaxen.pdf
    • http://cestovni-postylka.eu/userfiles/file/rafuvizenizobinorabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=procrastination+and+online+learning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8d.bin
1f1c64f383f81217a32adbad02434efbd9a71dbe3776eec038a7e94f94004fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 17336 bytes
font_01_sfnt_off00012746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 16792 bytes
font_02_sfnt_off00013f5d.bin
d4a180773a9cfc19494ac7814a87d97b7ed7ec87e6bfeace9d5dd08024984624
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5D 10544 bytes