Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a30c14ca70dbd7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 12:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 673d8d03c4e9596d7bdb8e5a0e47c0b1 SHA-1: 8e5d584aecd5a467170d131c062f0da32cb7b54c SHA-256: d8a30c14ca70dbd7f2a144ea59551c6b7fece072d8c9681bf07008b12e668c3d
164 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a high number of external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://colorfulmedia.de/fotki/fotki/file/varekomizamevanorez.pdf In PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/vigejizopisewikuw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f99d66263---rejapubelorutoninutov.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e209b04593---47785014678.pdfIn PDF document text
    • https://tomas-music.com/contents/files/73228321965.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/texafepukovodomexumiwize.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/85690990551.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/reniwivanewubejarivadopet.pdfIn PDF document text
    • http://didula.com/img/file/mixebodof.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/47680785677.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210912124949_khie9r.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/fetilawajegaleba.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ea47f2789c3c2fe83ad182d05efd6206/89660904229.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210915141135_611547.pdfIn PDF document text
    • http://climtech.com/files/files/45310383673.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sitojogog.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/pekusineminuz.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/37187405553.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/39126321019.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109150253023006.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/xivipawirivapemibifamuzul.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/zojugaxilobap.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/19494167706133d2b534b91.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613594dcec618---mosigeroraxe.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zadetep.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/lubowemibebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cod+mw2+remastered+free+downloadPDF 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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 18432 bytes
SHA-256: 4cfe699c37cbcb685fb26a9ea4c72fb4ffd7ab45d221f04089c76cbb82ad7179
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10660 bytes
SHA-256: 1c40e0e27afdd2f9e88ed1e5bcb0575abf802d4c0a9cfdb35ed54e6aac85d3ac