Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca84c8094ecfb1e5…

MALICIOUS

PDF

100.2 KB Created: 2021-07-16 13:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 573aba6156d90bc4d157323ba24778b7 SHA-1: 055794d9174c0ba64457d2945e3e037a2da995d8 SHA-256: ca84c8094ecfb1e51494bdefd92d0c9acb058bd1f9f425d65ce186b13f36da1e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, pointing to numerous compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd1e41483---juvobanelepatu.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d89ea3ac---wasofopi.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/xejoxebaruribadafew.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16093f778e918d---66079205800.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/13524901835.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ilcfdjb3vun69o5od2skttrfio/59296961621.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8rdlmjgve52g4ietb4c5bjt7h3/bugurebimaweganarugato.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/472f6bb1368310ad535b3130f769ca58/20366351832.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jevojisosuzoledomawigamuk.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/83927228382.pdfIn PDF document text
    • http://whatdwellswithin.com/file/99546207911.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a34b146ae04dd0eb7b9adc2670ab8e6a/13838212458.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wifakedadamoba.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acab31e261d---96530866049.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dba576a3b---38091331025.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607950d99af38---95759936094.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/53462900762.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16099db68520e1---bofisejaxuxijagoguseg.pdfIn PDF document text
    • http://cartopack.com/Images/file/3665853038.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06c3d5d5d---1120327342.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/063e71c874344807b1e5523dae0f6cf8/luvajudedobugasivugez.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/40b7cb42e14bbc072a7e695994193734/44245738727.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zegejasomer.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8hdckhgumusefeickev71dbevk/88232601826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+many+iron+maiden+songs+are+therePDF 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_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 16684 bytes
SHA-256: 5cad2a401d1d89a165df3b4c5c5b7380a627225ca5e5da3b4f58b3c1533d49e4
font_01_sfnt_off0001527b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A92 10840 bytes
SHA-256: d76b208e03cdc781d482a751a0925639e25eecbf8004665fda1b0433febb9e63

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