Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a93f1323ef0bf5f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-04 04:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a2cef47550cf9664df19703b97bd953 SHA-1: a4b62e9b044e8b49f80b26676cc40e4585addcfa SHA-256: 7a93f1323ef0bf5ffc91139a013867d3688ebcd91b870342c6fefc498470c1dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick the user into downloading a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 https://anakaygame.com/calisma2/files/uploads/3399623221.pdf
    • https://istocdukkan.com/userfiles/files/mupuraw.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c42de04d3---duxewanud.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/itkvenkst1hnrm3r5kfnog15n2/wisomedekonulomuxeb.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f2fa7370eb45def8f29213198717852/78629071914.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e585580c0---463275392.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vhijff4cfr1g7r3cbn7cfqmav1/nugawuxiwipexekulosubuzi.pdf
    • http://chickendaylacrescenta.com/uploads/files/kumewinudad.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3622c4b0a---75038044988.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafam.pdf
    • https://contabil-fiscal.ro/mm/file/90346738234.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d095cb701e---bonodigunujiferifalo.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a56778ce609---batodewebuxo.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa55b71237---41182257863.pdf
    • http://montgomery71.com/clients/34132/File/tomuvoxubawekuzujunugob.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41ec3a0a7---nepuganexitusitagojuturew.pdf
    • http://wonikqnc.com/upload/editor/file/1622793621.pdf
    • http://sgd42.ru/userfiles/file/85235535503.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5150e3e0a5---24000674317.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d47c8dea---widafi.pdf
    • http://akinmedical.com/uploads/file/81110039206.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8dc02a0---jiladoloxarupo.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc24997584---36244635181.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+eliminate+page+breaks+in+word
    • 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_off0000e262.bin
af245cbc65209633a8c873eb876c6570f65a0c3d8ed6394017faf032b8043f36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 16636 bytes
font_01_sfnt_off00010da6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16792 bytes
font_02_sfnt_off000125bd.bin
0cf19636acebddffdc5ecd10d2e50e4a64b7f128fd6216f40385c43f22a9e32d
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 11044 bytes