Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0c237a171bc425…

MALICIOUS

PDF

101.1 KB Created: 2021-07-16 10:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef696dcec7abe17476dcacc3af65438 SHA-1: 8c3138aa94af57d182e6ab95963f64c1b5d75bad SHA-256: 7a0c237a171bc425702ccf97e8467490d9193e1786a893270d7e0fb3af9f8df2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. No scripts were extracted, but the structure and URLs point to a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://philabc.ru/uplcv?utm_term=layer+poultry+farming+cost PDF link annotation
    • http://opuspointpartner.com/ckfinder/userfiles/files/xapokavawiseroravo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99aad2a96---90506392739.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a0403f197fb---jirexubixifinem.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/gogebufutidib.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b259287f6---rikalalu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849858e05b3---37470129936.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78dfdeca5---48330407679.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zekegoxulodifez.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/755860d9b90783f28ca3e309d382aa88/jojonovenonodigujikiko.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/lobupomigijiwuka.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/verewifir.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed76717ba6---vajanoxukolakotokipig.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/90877122090.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/30964300956.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1953210b8bf9fb8b569317a48ea71feb/wukuxedomunugarop.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ed98df13121001d7a8eb582e16b8eaeb/53030663495.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/74585938980.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a00240d66a5---6517393205.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/srq797o9045re82g0ttire11hk/datiwi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/numiwerokulutafixanixov.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/grhuj12dq51trdi1fp94voq1nf/liteguxeruwuwiv.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/lev27bojaf00b40mjjj8bm929b/89787822913.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743703f413f---pogifuzegujotimoxan.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f99b4cdacbd6b8c1dd413b0ea12e0fcb/mofazojofigas.pdfIn PDF document text
    • 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_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 17040 bytes
SHA-256: bf1ae0875ab468da1fa6b92465ec3dfcba076f5d5791f04a6a980c60d7ee3d02
font_01_sfnt_off00015585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9C 10992 bytes
SHA-256: 8ba517a31140c71e0eca1951fcac8ad94e10de1b2a66181e1899a806fe3af42d

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