Malicious PDF — malware analysis report

Static analysis result for SHA-256 f331483124c9d1c9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 21:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fae1ea7c9711d87cf1cdcf1f6a52a18 SHA-1: 29a45fc803539772465f795c590b7ea1249c4565 SHA-256: f331483124c9d1c9a790265c37ab5c4b8c99fa784e49cb6d5cfa3b5ff36246fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gkz-crimea.ru/userfiles/file/jejirajaxazek.pdf In PDF document text
    • https://ans5680.preneed91.com/upload/files/83243886272.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/67837298085.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/52366971385.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905232733.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/77866950093.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d038dd2a3e---67081083486.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/6532946616.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135469174be0---vepabobusow.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/wegelepamasexefuluninavo.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/88975438379.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/66369219994.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/24269326724.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xerevaxeged.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pufuzi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2e1bbafab3b1ba8f536195f4e1ceb8d3/lavan.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/bodapedumajeludosized.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2d404cfd---86836878128.pdfIn PDF document text
    • http://remobudostol.pl/pliki/62948253934.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/relupakezepubonegibaz.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zitarebupepuve.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/ludok.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sunekipomula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=viewpager+add+fragment+dynamicallyPDF 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_off0000ba67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 16608 bytes
SHA-256: d44a6b2ce9f4d6b77c20a6750c19950a7ab7da7f6e428fdfe9ddfa4ff23f8a92
font_02_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10844 bytes
SHA-256: d6e0aec59922fec22a04b57e6fe8aaba38abef28778dd695c3f0d28c20fc396a