Malicious PDF — malware analysis report

Static analysis result for SHA-256 a782e3b29dbd6e04…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 07:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db5e79a201e31c6a76ac95547e91710f SHA-1: c2e2909cbbfc843c11e7eaceb984ab9c322880e0 SHA-256: a782e3b29dbd6e04c9b7fd0eda04b77ef19b5ae61071df10a461d50952ed8b68
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. The presence of numerous links suggests an attempt to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://lorofilmes.com/Uploads/ckfinder/userfiles/files/lajigupivenuj.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16152a6f8577dc---vuvigoxelunosuginit.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/11012710885.pdfIn PDF document text
    • https://laser123.com/geektic/files/24229202770.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/50651695860.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t93at4q65hd83g5c2ib49h9rra/sexatomefig.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mixivozomebufisoxoz.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/35866236647.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/6453881436.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tafutafuw.pdfIn PDF document text
    • https://nomortiga.com/contents/files/lekuzi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/xefusem.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/58386436180.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/3185172444.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/89679457727.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/11380185289.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/58733150960.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/78635218538.pdfIn PDF document text
    • http://anpo.vn/upload/files/7737416934.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e72c4d38---13183006716.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/bijegobitipegujuso.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/96b84e94a7ea8753ec2d3f798b0e3100/17392055768.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/21275968517.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/lunodetewebinodafalukepi.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/penikekokakuluv.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/66493041778.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/pakomuzidago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=football+streaming+websites+for+freePDF 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_off0000b4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 10760 bytes
SHA-256: 1a51008eb60199c12198b32aeaaf9a92211db48f441bb0167c6dd17a6aa5b221
font_02_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 15428 bytes
SHA-256: 95e41020aead8d82fc4f0dd82a8bec36dcdc6be0376fae23a2b0473a4d3b1a2d