Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de73a67968c0d43…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 19:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48834d21863e50da017bdb239adc2996 SHA-1: ffa1b3aff5270c1d0369491c6f7cfa3fe030249d SHA-256: 4de73a67968c0d4394af283f8a2683df944d0ddd61491d838b739645afc4059b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised WordPress sites. The embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=truecaller+prime+gold+apk+download PDF link annotation
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jlrrq2udnqumpqemlil920c4f0/62895932955.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/baluzapekisezeratexu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/bogamomojefupijuru.pdfIn PDF document text
    • http://cartopack.be/Images/file/69921057751.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tnar7jl95jv6hjj02deogbf09d/sekukawivoxawopevasegilux.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/12476863515.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/repumoxugowapabiwidofu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///moduzox.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/19510079975.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/94688271870.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/28151871307.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210913103415.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lusofizinenanokilo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613671d5eed59---54217235520.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/31456431618.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/33545085105.pdfIn PDF document text
    • https://limsurdua.com/contents/files/7606019337.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/2129689083.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/1558611241.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/19902435243.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/60427533449.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109091714266456.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/fefexew.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/78057096464.pdfIn PDF document text
    • 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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 17612 bytes
SHA-256: 332bba6e48c43145cc4db5816037ac6cc97e231e4a0a9e7712a3630edb879268
font_01_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 10832 bytes
SHA-256: 2ec1b16ba6fed8da40a79320ba780bc4b90e98e2b86415c2fc0494ece588dcc3