Malicious PDF — malware analysis report

Static analysis result for SHA-256 518f68d86071b1b8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 06:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f9b2c050876db9183f6c7ad126c9b48 SHA-1: aece8397e26ad4b1f5ac8eb4771d656f14712885 SHA-256: 518f68d86071b1b82ce36587eafd01b41dac2b462baa53bcddd0b51b94dc2e01
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as a lure to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/193nj2c6rb9i8ato1hgjlnvm42/14055962374.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///11068352033.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/pakuwafifukokijopatufupe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c7ea9f60a9d5ce48907ebcdf38145ae2/44379736616.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5b6eed19f4db3b9fe009af0a02730d96/63811284297.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5826509f93---fofiroxorabovanisix.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e52d3481---55206134417.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/xisaxatoxaderoka.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8d95f85b---92240729222.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/16861107998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f13f12e3---37276392621.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ce337496---musuxabudalu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb940158f---kipivudosunotule.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/ginujijipigifoz.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/16183962400.pdfIn PDF document text
    • https://maisonforville.be/documents/file/93040423462.pdfIn PDF document text
    • https://denimder.org/resimler/files/95641830078.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/68138489262.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/7245723703.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sexetugidogo.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8081d058fabc2928f3ee9e0c3877fb08/fevodejuk.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608826b924513---26663857727.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/fuxozimoririjiruke.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/59d5fba60006dbfcbad2864ed6344504/fatakatuvuxuwidizunalopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=plainsong+responses+pdfPDF 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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 17752 bytes
SHA-256: cafcb9bb7ae9edcf07d3a64e4bba51d473a31f113d68f5dd8d2575bcda083fb7
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 10576 bytes
SHA-256: e8b30777fe01be8fdf1ac227a129bdc20aa7b1f0f1c08f5ee189b7f3c3d4afa7
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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