Malicious PDF — malware analysis report

Static analysis result for SHA-256 a705bb42346ef24e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 05:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1270e4759a0ec651cec52246670025f8 SHA-1: 5c613587381b31963b51370f931eef00ab7f17dd SHA-256: a705bb42346ef24ef783f07bb6de3397b725b15402a6616f932f0a42a4e8f79b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content, aligning with phishing and malicious URL distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e078eb98---nuxazonolorewimafojezar.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0h0v1f9kalol0fb93imabk0al5/sokebogenaxujodujad.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/68161770920.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/9247503370.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7dd32247a2361fbbc808489c685e5dd2/gimulevageditipusaz.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/kopodul.pdfIn PDF document text
    • http://ashioke.com/images/library/File/50771821562.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/mosojuxeduxuzu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/038de6343db0af4666bf3fde7879ee09/71213390180.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/78615786668.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/76658666730.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/84391682972.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/233364d90c0d2e6aa3004f51aedd904f/28787502117.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bapojojagilajojusukutide.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jazazekodadose.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/dilutekivisomosibok.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/2870698376.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210529144232.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a90a6b0b---jevivogotejabozi.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/78069261403.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/77651010046.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f60203cb6d4---nezuropuxi.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210629_134313.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fivuzuvo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/tepunikawudapiwo.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/silolasaxipovomaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=course+reflection+essayPDF 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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 16976 bytes
SHA-256: 4480445842cdf68d9a41d561f98edf32dbe5e4ec4b09cde6485e099fd9be4c54
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10576 bytes
SHA-256: c3d75f7c289e2df8400dfd27139cab4dfd0600bbf13010399eaec9caea58dbb2

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