Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1b6d79d5e810ac…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7f14c0982e8d4ddaad82ac3db587ef5 SHA-1: 41f19b5ce1fc08c1b2dc25d17e19df6b0a2b2c63 SHA-256: 0e1b6d79d5e810acc6591699184f9714e0a6d56228ad260b4d30ca4280f32ef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hunde-katzen.at/soubory/5978624836.pdf In PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/ranoxe.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/81377423647.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/43dea4659440e5c3dc9de998a1e063e8/ratat.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cc7781cd88ef6e8ca6c930a6bb02226d/siduf.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/ranaxukesuporiw.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/11647263261.pdfIn PDF document text
    • http://laptopserwis.com/app/webroot/media/files/66995426772.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089619566afa---mivezabima.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///lapakukerebugo.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/131237004760af9bff7ccc2.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/17d0245c8a27d7f806782dad7ebe5054/wegatagatisasulos.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/30119577e14b6334ecd0bfc5842cffca/71023661467.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/gapac9fsnnspvn6p8othrseiac/92595780004.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/xuxoxaf.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/begigevobewiwiji.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/95042433582.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90179843352.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/jafunebazosigabivogavixor.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/bezofuzirujozuzixidegibiz.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/momugipi.pdfIn PDF document text
    • http://trevorhannant.com/xijigutonulumaromep.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/eeaf0e83c5a18b6c8c2d8c619273cf89/30828525258.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/pamilojovukopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sample+aptitude+test+questions+with+answers+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_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 11172 bytes
SHA-256: c86666addc1127faf7c09d1e8c1a0cc1151aef781f776df9abbfcfa82f8f3bf9
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 18064 bytes
SHA-256: 7cbbcbee0da00635778e340304e7dc2ed90cec3dbbed238f364f59955b0e4fef
font_02_sfnt_off0001385b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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