Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a12ac211d06c4c3…

MALICIOUS

PDF

83.8 KB Created: 2021-10-13 00:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 406d7ce4d27888c6d7af9b968b52f960 SHA-1: b73bfd857837c09e761b0488bfb4f33f0abfec4c SHA-256: 1a12ac211d06c4c36d31114b1b38698dc9f63dc21084e527968252d746dbb416
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145453571456---riwazemexatamebavididogin.pdf In PDF document text
    • http://fredericjean.net/oplusco/file/xuzogagivagarivag.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d6c9bc636524ad9c51bdfa7c598787ef/kuvelorujux.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/39318300437.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/semap.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/wowovunusupapibe.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/puduvetavugajogebeva.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/92547646275.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/55730103765.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ake6hfldi32287njmrvn2tc6m7/sovazuv.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hn83hft0ejf1oqp141gdcm3lls/kipofizumuzopaw.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lisurufaw.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/72788023116.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/monowebizisusuzujosav.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20211003_063130.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/lonokubogejevunotejas.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/69645367543.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20211013_B5BCA660999D9259.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/35195275869.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/fanabi.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/12466399446.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615c5de3734ee---73318783405.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/wopavolekil.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/36657150861.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jadodurunijuvivisi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=what+is+boarding+hockeyPDF 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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 10944 bytes
SHA-256: 8d01031b67f85c9073ceeaefad83b3c7827d23048d53b73f4a27e4c4a3f5e8d7
font_01_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 18896 bytes
SHA-256: dcfa92541759ef384592fd1a6c78121e93e3e23e11d5460e4c64375e36aaf792