Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a606bdd6ef3a13…

MALICIOUS

PDF

81.5 KB Created: 2021-10-13 08:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04bd460b762f5c2e5f610765922d862c SHA-1: 522b0dc529e6393f96860261aee5157099fcc9f4 SHA-256: f7a606bdd6ef3a13bc4e2b0664ddd5aa2447dc11f5011cf7ed98399863947882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thebeautyofdesign.nl/ckfinder/userfiles/files/98001040774.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/deu6jiniv08ltr9n5hi3fsbtsf/zapupokudu.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/buregilavarevoduzezamo.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/nofukuwipog.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/mijeribiladen.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/webutolu.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/65621137731.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1633916539_1.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/10553220277.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/75763330750.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/70431319889.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b7e52372168eccc6a811c21d7d6d354/30084163455.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/23661636469.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d95ab61a214e29f3d9dd354171792614/valapekuziteda.pdfIn PDF document text
    • http://envigest.cz/upload/file/nuvonivotij.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/togoka.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/tusefuzikujinuk.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/nebadadex.pdfIn PDF document text
    • http://lagrupacio.cat/file/97924146097.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/60148470140.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/robigaromatabenud.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/11627904627.pdfIn PDF document text
    • http://esejsc.com/upload/files/ramofanekimirigap.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/mugodafafefikutixexu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=how+to+hack+using+kali+linux+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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 18652 bytes
SHA-256: 2b15d71d9ad7689a8c7f0a891583522b6eac1ba75b8b1a3cb31c3bcb4a8da8d5
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 11040 bytes
SHA-256: d141d736090538797e8b7b105139bd15b849c2e5f85c766f13a36fe3fe352881

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