Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d58821cccb03da…

MALICIOUS

PDF

79.6 KB Created: 2021-07-08 09:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c52b1b01d497228b747d8866cfe67733 SHA-1: 847a777f5c30f3db587aa843c1e56cf185d58b6a SHA-256: b1d58821cccb03dabec45c68394630d0a900c455f9d9cda92766cf6ce8279b83
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4pntglgselbjv5fthsvo1v1b06/83967201860.pdf In PDF document text
    • http://aweibel.com/Photo/file/sunujelutob.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/wavinif.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0fe9bc3043392fe7dec00bf15ef65748/15762127847.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/le3sd79kk4r4n0ecokinh2t6po/99278610705.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd41c6a0e9---kavuporuvafomikisonox.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0d5e35a8---lapalivunamezixunokuzare.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/zulonam.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/altmmkv15tlnt9o32bu33hi2e7/26895007871.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/sosodag.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/73213725585.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259a87f7f3---36196046107.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/goxisiberawuliwa.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/volatofuzuf.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69fef59685---lemirakesu.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dazesivu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u7s7uau4udef93ckbesfn9k5at/xugogozu.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/wipes.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607696b43199a---firalubapa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/87822131250.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/29842621856.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/xosuzavepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+crucible+character+chart+act+1PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 10192 bytes
SHA-256: 4c9e0bf6ad4ce7e2ee8419ac738cdeeee3d8628f10cabd7f032e6a0651af4471
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16368 bytes
SHA-256: 956445476908fc6e2267fa1100d9585be5faaaed02274e80fa276648ba291262

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