Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67d93eec28def39…

MALICIOUS

PDF

87.4 KB Created: 2021-09-10 19:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e58d96d1e793558eba52c7f4c35cab3 SHA-1: 5ad85b0fe4a0668eacf103272fe12ec0c0824fe9 SHA-256: b67d93eec28def392b084f33c26a83b89724c6d27f600bca7365021014465735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://protok.pro/upload/files/ligesebilati.pdf In PDF document text
    • http://sbkf.org/files/files/52077036713.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/48463752973.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/voveve.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/46445533916.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/rowokezer.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/sibasi.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210905_88351FBC71800FBA.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fibixivujuwokuj.pdfIn PDF document text
    • http://pololanna.com/user_img/files/59673338167.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/35348076055.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/wemotomajav.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/38302820088.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/9619353020.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ac8c2dc---18503691137.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/97149356790.pdfIn PDF document text
    • https://luminex.pl/upload/file/relujofedipikugat.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395ec959635---femimago.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/pemuwovagefuw.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/94ac77585094223810df5a5a870c85e1/9376968199.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/sukofusiwotuxawe.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/10542412361.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/lilixunoduseruko.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/f44a81e437b315bfc35cae836ba316b1/nuxoxilebinukanimukilutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+send+a+text+on+my+android+phonePDF 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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10904 bytes
SHA-256: 147f9212f95bcff492ebf7f9de78fc593e6057d4394d6667b06066614c98dfbd
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 18240 bytes
SHA-256: 06d60c901c73a5b80e9574c0553f6b0aef96b454203a490ff06e792ad51296d5
font_02_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1