Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2ef8b3c48b2fcc…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 20:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e4867fae45b2b9b0705f14107510e9b SHA-1: b0f2ce85c97d940c8c668ada33e5d80acbec9bc6 SHA-256: ec2ef8b3c48b2fcc743fb950dc76d50d00feac0ba88cff8937d2e77ec1c17d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=displacement+definition+physics PDF link annotation
    • http://be-now.pl/userfiles/file/voxijagedopijewo.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910102220.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b287123f8---84709252586.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/davolisojutedovuxasune.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/golofotofiwajepuje.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/90086565992.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0761b56b---63399158595.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6qrnho1jjsh86o5f7dp2a5vuc3/60057841444.pdfIn PDF document text
    • http://carbonelite.ru/file/bowowiwerekisefokoba.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/tonexetegexinej.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vatewejomirinoxod.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/77783254011.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wuxowegebepepixex.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6438a68780aad8fc9cf610e5093e7641/76705396.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/15214350948.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/38360041388.pdfIn PDF document text
    • http://biosite.ru/images/news/file/11025798111.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/11163169703.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/25db65c0d73d6568e9aaff663ae30782/foruwuxadilo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614438f767ee0---35039906235.pdfIn PDF document text
    • https://12shio3.com/contents/files/lovesebaxevolu.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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 17432 bytes
SHA-256: 4e5fc9683082a5df89f8e61be87ae09e7f232f0f39504c88a2d68f9cc203420a
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10900 bytes
SHA-256: 069dcd1ca316ebcba054d542bc829fdae586d99e93e9824fd32ebb9d1a778022