Malicious PDF — malware analysis report

Static analysis result for SHA-256 961c07c744a4e224…

MALICIOUS

PDF

95.7 KB Created: 2021-07-24 02:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05140a64d6c1ce10ae6175eed1311d42 SHA-1: c29c1f4a29a9b89e5735d97c0d7baf668c76c940 SHA-256: 961c07c744a4e2242c8aefffaafc7054070f09ac778c7e01ed0a09473f83b622
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, limiting the analysis to the link structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://attack.lt/images/files/75839433982.pdf In PDF document text
    • http://stylowa-pss.pl/userfiles/file/87093767508.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kexunovinaxumejaselop.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/10887916713.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1365e6cf86---radinuxalidamokafuduj.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/sapikukat.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77898092332.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/9425637126.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nopegen.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/9743535215.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/3755391994.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/68f39b0e24df82c211dd5cfe81aed88b/29921524736.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/juxetuwipodimugimubaw.pdfIn PDF document text
    • https://t2sc.me/userfiles/jitejikokovipuvob.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/17445712101.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2i41j3t6csftjbh0h4n3s01v2/43856649354.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/lozone.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160947385c6d2b---42115031359.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160883d898153a---72336383774.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2799b14507d31247670325e358b40ebc/11806348394.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2925f9b42a---46913938129.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/78182488981.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/83147539134.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l13ksacnagr4tepvo3rdknm83n/rugit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lami%27s+theorem+is+applicable+for+how+many+forcesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf03cdbf6---nelinuweketiduvam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16068 bytes
SHA-256: fa6ccb131c81168a50db32fb55eb3f15dd0b07c02dd6f7726332a179c550b225
font_01_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 18532 bytes
SHA-256: 417fe2411f3b34655abf7f8b59e289df113f1307de8508ae750b8d69fdbce51c
font_02_sfnt_off00013e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15620 11076 bytes
SHA-256: 61e4429fb8fdf9fb4c858fdb4d9e8c82533b1809758382733aa27cb78dc2d56b