Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca02da52ef309cc…

MALICIOUS

PDF

91.9 KB Created: 2021-09-10 00:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 359c0ea2008508b75235e3313daf38e7 SHA-1: c7031275353571a7e8cc7c991811ae6c0f5948c4 SHA-256: 0ca02da52ef309cc72a39f9a86f6075a31c0fe592bc7b0a3f7bbc57d66c8ebce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://silverbirdmarketing.com/pages/images/file/59343414996.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5021f4b3---11010195725.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/32381004939.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/vofagilutawesodugiko.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/gefiretugunoko.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/18052671014.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/batafelazumewokapopalafip.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/45770112194.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137308f7ad4a---wavagizaxuji.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/bitimida.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109100507118391.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/39036681504.pdfIn PDF document text
    • http://normel.org/files/upload/file/1455826427.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/34488604486.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/28600806111.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42170824625.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dukowi.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/75034750654.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1982a9d9---saroka.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/21361716871.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zibesuxasisesubanike.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26ec4fa9---kadazoduzuwijobara.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/degabuxajawozumugejabe.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
    • https://maviet.vn/upload/files/rifiwatoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cinema+one+movies+onlinePDF 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_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 10168 bytes
SHA-256: 1a9242d714e628c006370fb26647041248ec646b4c7cfc7355f330de2e3f84e9
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 17228 bytes
SHA-256: 9097461cd3d0566d075c2da4b08725f9b40e09473dd5fb61ba1ed4bd81bc8113

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