Malicious PDF — malware analysis report

Static analysis result for SHA-256 118d8a924a3f37b2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 09:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce510df0b729da1b5002c5c93620d4db SHA-1: 78d5b86a5cf8bea38e9545ffeac454069794e27b SHA-256: 118d8a924a3f37b20e7df00f7388d59f3047ceb3173da2a5e828f52537d7355d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to a compromised WordPress site and other unknown domains. The presence of embedded URLs and the nature of the heuristics suggest it is designed to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdf In PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/49014759946.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/gapevosukijesugajesuwu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/26976875982.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce45f2ffe8ec4f097a5ecd0f121dae62/34685807371.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/79692613452.pdfIn PDF document text
    • https://hse.tw/upload/file/50054627726.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/81923710103.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/fiketixatejajupaga.pdfIn PDF document text
    • http://yepuco.com/uploads/files/lopifu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c00ed1042---96993159108.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/62443779998.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132943ca2e5f---70882347505.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/4941499891.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/bapafegolut.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/54167282534.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fubapuxabotusanujuw.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/737f7e10944c9006c41330108e9628ff/52769063074.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109021129235892.pdfIn PDF document text
    • http://hocomesun.com/upload/vaxibepog.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/65616252727.pdfIn PDF document text
    • http://primaneighbors.com/userimages/wemakovuwezu.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/kegemafeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bmp+to+pdf+windows+10PDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10532 bytes
SHA-256: 9476c3cbfb8816c1ba1cba4591b35ef64412f088353f8c406d0df5c263ae1f70
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 16976 bytes
SHA-256: a91031415707653e677b7ddff5572b1835b4342e2037b68f4b1300b797e3718e
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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