Malicious PDF — malware analysis report

Static analysis result for SHA-256 52318bc29bbfec95…

MALICIOUS

PDF

122.4 KB Created: 2021-06-27 03:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b65e0f87fec5c5713bafe23d044620f6 SHA-1: 041f342121f5e1be7ca7bbbeef18d1e64ed80d6a SHA-256: 52318bc29bbfec95b8c091f7447881d906393663e5da20658e66e6e240afa9d2
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 domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cccf80dddd---nanasepojaxalovidisuwu.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qs4b9548ni1pe5dnjm2mnr5ls6/7449332200.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5c1bf499---simiwadeva.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ttj0qtu87vllo08e7f92552o4j/67015798020.pdf
    • http://aelma.com/sites/default/userfiles/file/24504714320.pdf
    • http://ahcxdq.com/uploads/file/300022498615.pdf
    • http://tuzvedo.hu/elemek/file/39078766869.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjilfeorndg8nuk8dlssdvk00f/vovirefoto.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jfkj0f3thas49ft0ukjgvrgops/fusodezefamotakimu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde1a36adb---49400893996.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cb491fa92---tozevozibebegumogubam.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tein3n7i7ahgciahh3gg6jb5fk/29474293411.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8dc8c50cd---849862095.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d431cb8940---67762429219.pdf
    • https://queensflower.nl/clientfiles/33987155937.pdf
    • http://limeitec.com/upfiles/editor/files/85598865139.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b169774e---takokanev.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adce5369ed1---xikaroresiz.pdf
    • http://bhk-aindling.com/userfiles/files/78804796479.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ec0021ef---waderosazivojuxovumulo.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608196b83d747---guragisizutixubozazod.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/59337080045.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077518e989ac---baratesonep.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823481a5d2d---46045146923.pdf
    • http://archi1919.com/smlclub-files/file/61102802298.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+undo+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000188bc.bin
7c12167704936de2c9eb902af7737a956172e906718b279520f82512289ec0a6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x188BC 28116 bytes
font_00_sfnt_off00011071.bin
240f407de7d81f3a9b0711a604b58231c48c968ee55515ea165bb8c510cbb2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10528 bytes
font_01_sfnt_off00012817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16792 bytes
font_02_sfnt_off00014029.bin
372fe475423fc9381a5c66c43fbb482e7a8b3287702f640d07101eb69c5c09f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14029 31164 bytes
font_04_sfnt_off0001bc63.bin
7896409330b645212267a80522c080e0dc88a46969b25e3212231d8369094946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC63 8884 bytes

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