Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac30c82008986362…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 19:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fe7002fb4f3d406429cbda75f48777a SHA-1: 52d2ee38470287f0ad4fe4f694134c031fafe45a SHA-256: ac30c820089863622fbe9abf1686c23de92147c97b1cd0f63f05da6e4b558f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The presence of external URIs and link farms suggests the document is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=fzmovies+2021+download PDF link annotation
    • http://vivatbacchus.hu/files/file/jopudevokovive.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/95402098322.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/gefinebobal.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/retuzedimawuxomawasid.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/68593847178.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/27102250771.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/mitevawulasufolaru.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ea2309ad---veteragupaxuzovubog.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/lakiwaxiretolizonopili.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/relabipapadase.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/77080854785.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/17227927937.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/bivosurudus.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/63116796934.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/733304414.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebc3a8dc5---befagebe.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c319ea71227d2f4516b0f35c3eff9409/votasi.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/fapanojikevokimawepa.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/retubile.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86884089891.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/jonobomugewapis.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8b128a6d---govosekumejewow.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348f89c261f---zanotabatategavose.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/11909404172.pdfIn PDF document text
    • 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_off0000b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 10696 bytes
SHA-256: 9feaa9f4a1c7c1baa08dfd5e65d4f41f37086edd03cf6bf1fc6f36a1abbe3b81
font_02_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 16368 bytes
SHA-256: e20aefe27f31bb36d8db5b5a333728e0fde6db60b3efd6f49294d62311fbe4a3

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