Malicious PDF — malware analysis report

Static analysis result for SHA-256 42054a3d87444e9c…

MALICIOUS

PDF

82.7 KB Created: 2021-06-29 10:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb1d15d2c51b0de5003c2ede35b35b33 SHA-1: a8df6deab683e6b9bdbb1633dbfcfdf93703ce6f SHA-256: 42054a3d87444e9cc4b576c27e5436846bd93b6b3929e3d26f0f653eecfa62ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDFs. This suggests a link farm designed to redirect users to malicious content, likely for phishing or to serve further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0958f2731---34868055142.pdf
    • https://aulacvn.com/upload/fck/file/parozun.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/oivas9gpbnh59f83fh7pe0iju7/vuzep.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ff1e8a06---medanikufetodotuxiku.pdf
    • https://shibbirs.com/media/files/491819527.pdf
    • http://www.chatanakonci.cz/userfiles/file/61924608454.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f2215b093d594da7432273f5e7afd143/nunifu.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa670ba13f---jisunigozikutobexabafize.pdf
    • http://childhood-matters.com/clients/49507/File/jafuvixubu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f967336e9f---65631126966.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e343d228d---juzekokaxixalaru.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1lvdt38miunv3pvrn7gr34brc2/93195869215.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/vuzunolotaliwoba.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160990b99d85cc---ferenizovirutubog.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb89f3b75a---biwum.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/c3b77537d57f31b49ae579ad5461ebe7/58215370286.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c02aa11b4---56032295672.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uuj8kvqlfbt43dn52cudthdo8r/xofidafepagimexuxabamil.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ccf27eea4---dojagi.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4c0d1ccd---68923815091.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pcncj4j78ocu3ior15blkriuk4/xozono.pdf
    • http://wowbond.com/upload/Fckeditor/file/32403244623.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/252ad75bd33404af50f56cd4e2f8b258/10554020723.pdf
    • http://wannawwannie.pl/userfiles/file/dikadigeverajogufaguwax.pdf
    • http://shuswapladystriders.ca/userfiles/file/zokulimufajif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=we+are+there
    • 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_off0000e03c.bin
694b0b841f045af0cba3c80743f031d186d7673eea65feeaddc3c22e52aecb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 18880 bytes
font_01_sfnt_off00010f30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 16792 bytes
font_02_sfnt_off00012746.bin
148483c55b025d4f4488f284bc9b4277d12437f37661b7ad5375dd0693d3da7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 9668 bytes

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