Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab0981b495652c3…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 02:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbf01eba942fa4d72cf548bfd727594e SHA-1: 63cb8a7d67273e5332fc359ec9f85d78950c13dc SHA-256: 2ab0981b495652c37fd31ae15e96f7f6ec4b69d1f4ee749e6ebe00642b2c2890
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. This behavior is consistent with a link farm designed to direct users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://changrung.com/ckfinder/userfiles/files/69944141534.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3830bc1da8c289ca9dbab389f66a18dd/rulofotaketenix.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115418aa8b8f---90074521456.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/nenof.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c0bef812c010996201c78f83b85adae0/62878227761.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jozezivonutoxevavorone.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834f39fcef---25700026074.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xuzedunukimax.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210723132939.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8e28123f82bb23fa31c224d3513845c2/42040997287.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef6ee327d---77440826520.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16270461612133491448.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00307192d---51610775076.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/81385720348.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/vipakuxusurajiwemosivijin.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/mijukuronamemafewalagiger.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/4685120203.pdfIn PDF document text
    • https://led7.ru/file/80644466979.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/8464620200.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3569f65f3a---mufuwiwoxosadile.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/74539629149.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/37625987957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=watch+bootleg+movies+for+freePDF 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_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 10880 bytes
SHA-256: d86c2fef4d07b73758e118b6cd928dfeb3ac97b3d45e22d2669cade864595687
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 17112 bytes
SHA-256: d4a968bddb132d532dda6bbf844075101b2c5caae1db637c720a282cd5afe74e

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