Malicious PDF — malware analysis report

Static analysis result for SHA-256 447556ad54e9282c…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 22:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cb44fb1bd341178aa358d3856327773 SHA-1: 93e3b2a5d813c4620bc33ef89eb5c9fb7d2e1019 SHA-256: 447556ad54e9282cf7253508399b4a651dfe379465efef40f1ff38fe338ac0a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The presence of numerous external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17feb8b42---8922469270.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5378052658499223609d0a90bc4d92ce/zanerodularonu.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/12393315803.pdf
    • http://mid-europe-ex.com/images/blog//file/wojuzepejevab.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9478e9615c---pidadarikubow.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c03f61394---7904680176.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a85065d9afb0f078738c955959592ccf/gimovururalepevumose.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eaa3bdad2---wezopomimuzitu.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/dfa1ed35afa47220cedcf27d2854a466/79551875482.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6a5b2704---rumapexowelerixufegogerag.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3b582b7d---xowifetafuri.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6c4b318e55f6362ab42f13aeb2c6bc99/92385679422.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6850df1fc77102aa686f1e8d0e16358f/rifunuko.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0346j29oti7d8jlins4qlakiv5/mulenowotafopaladaba.pdf
    • http://yossy.biz/userfiles/file/waremifewopetasujizijenul.pdf
    • http://urgentcarepb.net/userfiles/file/48416042381.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8e2493a394c4ca970e24701c2eced6f0/gaxofebikivorurupumerawo.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/t08dlncpg8ojo8iab1esbvt8f8/99181963926.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092f5d551646---lotojibopikibobekafix.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a27eb8ae---42915779062.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085302bce977---mosojativipikekifapad.pdf
    • http://alituncer.com/userfiles/file/pixax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=words+with+rr+in+the+middle
    • 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_off0000ff78.bin
acc6ed03ceda70db6d5e1593a3c4a52e0ef2e35e9333b3025156c908ca0858fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 10428 bytes
font_01_sfnt_off000116e8.bin
3071bd7225399349759bcac5b38f2c102407d29b6394d0b2a19db49518f652ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 17340 bytes
font_02_sfnt_off00014390.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 16792 bytes

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