Malicious PDF — malware analysis report

Static analysis result for SHA-256 518786c01f9d0738…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 11:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3507d087fce210ae4d1be31607a2f5e SHA-1: 1a8eb8cb2898e20c740e05432500224e671b03d2 SHA-256: 518786c01f9d0738ffb2928e5c0c5548ddd407999441a476997a512b8b4a7bf0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised websites and disposable hosting, likely to trick users into downloading further malware. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alexanderkanevskyartgallery.com/clientMedia/file/sixumabotokokat.pdf In PDF document text
    • http://droneducational.com/admin/userfiles/file/18294606050.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798d3d5028b---82270248437.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/17429224336.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/mapofujopamek.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/29252209456.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0acbd17ebee2f8a97369ac92a185fba3/saguvod.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/83318336955.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/zuxufurovab.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/mowelomatifutimurafa.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840fb28caaf---57456624396.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/bomasuzexamowazagebixomem.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/xoginuwajefep.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/9929788816.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k9deckt97601nndefpue9ui4s0/83881062714.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/kaparipobom.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/42669911357.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/147e312e67cb065de8b716317d4943c4/8736949385.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/32195384508.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/27119441107.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/48777089535.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1964fc1b79---57669682037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=foxit+pdf+reader+free+download+for+pcPDF 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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10608 bytes
SHA-256: 7b04132d0bb04eb53867c7802e6f9a830abd300b22a33d34d542298bed7b2d0d
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 18296 bytes
SHA-256: 40bc32d0ec440f08412b751a035b56d68e7dc1225f727f28cc36c687c64c5a1c