Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a43fd7d287cc336…

MALICIOUS

PDF

132.3 KB Created: 2021-08-09 05:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0795ef9d4143ad420a5816aa1c6b0186 SHA-1: e52166245d0ef9f60fb2e1982617c2fba29b80d3 SHA-256: 2a43fd7d287cc336e16355680a280798273959f8d733d76f92d01b1f757219b4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using compromised sites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cc677b615be19c273e7cbb17ff5b510d/dezuzesanitov.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9fd4fe702c2e2bd538379ee349ad3edc/gupepururago.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/76318534081.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a1a591df053b239e5cef687d02c480e7/benafimuzurusevikuvavisuw.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/18800723118.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/7116766275.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/75658f9ede2ba5becabf9cc45fa216ca/42001964620.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/devetosinexajosubenare.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608464ea17235---mulisefabefixujeriwujorur.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e9da44d2---kavunefanigewegurapinoz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1e9f481797cded2019870d79ee51e70e/mawugipikezexoxopubinef.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/tafebujogetuxi.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xazejotonemaz.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899ab58cbeb---34540224733.pdfIn PDF document text
    • https://norservis.cz/files/files/tedimanovuxiw.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5239bea62---50955542324.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/a2la9150e7r1giu8dejba3g5h7/37503068954.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mi11hk2j1n5p8jmt370rms5c20/3880062906.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zigetezevuzovek.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/bce493924c3ec0ccf0b37cbef4ab4e3e/57481535049.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b96e68eea---ditejo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076843e40ea9---derudapuzadinevubow.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/vazuwatorizodojele.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/gitinurelogepaniperaze.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/8216875495.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/74006022289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fox+news+headlines+radio+anchorsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e77aeb5f450389aca29c56effa2992b2/gulajoxobemena.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_off0001a45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A45C 10536 bytes
SHA-256: 36b1ee4b51007cfc70715281bb69f185266248547ad32d02384de7d23fc9e2d9
font_01_sfnt_off0001bc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC51 17776 bytes
SHA-256: 20a89d9d7f2954fccea0a7b954b5bf0987511a2fed76dce193f47d215a477cb1
font_02_sfnt_off0001eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1