Malicious PDF — malware analysis report

Static analysis result for SHA-256 1647a0b57ef7e2f8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 01:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e2c4da2f70bd19ef277b48a6cd3aa14 SHA-1: 34b1b5160117f465ee9be8795c344a4ea6f23983 SHA-256: 1647a0b57ef7e2f83f74e55260c35131741217704b9d987203172c4ef1fad8fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec5aae5be---posuvopifumimilom.pdf In PDF document text
    • http://gancza.pl/userfiles/file/rujokodabafasuvu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xadusinogaxu.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/midugozeziwuw.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4a11a7e61c53467d1f509617d3909d2/xabazejevowen.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/vajunonevakejulugote.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zukod.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/chgkq986l8qn8v05inf9imnr56/64712947175.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wirewuvufabiziworu.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bunatis.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/28390301953.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2706bb391efbf08f1b9117dd5f8aa7d1/97686512717.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1d5b444803b733d06bf5aef26e0b0d7e/lafijobadapakezerutuf.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/19755483711.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/wifojefojaxukapirodijom.pdfIn PDF document text
    • http://raczcsalad.hu/files/29279008756.pdfIn PDF document text
    • https://citytrafik.nu/images/file/12626093262.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f44d3b6c6---52464153176.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3fdfb2904---suselesoxusutezuxajeguro.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/legogix.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/zijobimanapudop.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/kaxoketirovogajuvij.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a4698824e6981df0b8574bf875a3a40/xomirumadexetukemu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fiderivutofemuzef.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/wisizavutego.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/73068050655.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/43612495149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apc+smart+ups+rt+3000+manual+espa%C3%B1olPDF 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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 11024 bytes
SHA-256: b92ca6916de63d5e6dc439f4afe2e653d29ba1dd9da2b9d216f9a4f2a0139b35
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 20612 bytes
SHA-256: 943756c493dcdf2f8e4aed0f5a3d22568bef434d3ce2b53938273d0008f31d9e

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