Malicious PDF — malware analysis report

Static analysis result for SHA-256 f154aabbb721b818…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 02:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e62bf8c084cdb30b3f2a862ca5cccabf SHA-1: f3f81a1afefa6a9ddba1c00866bd47434e65df27 SHA-256: f154aabbb721b8189bd220a99e08ce1a280179f4f3d923df82738ff223ce4d31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It functions as a link farm, presenting numerous URLs that host other PDF files, suggesting a distribution mechanism for phishing or malware. The presence of compromised CMS upload links and disposable hosting indicates an attempt to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kientrucnhacuagio.com/upload/files/garigi.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8a1677e462a6bfa9aed43c062d24dfe2/46732136035.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/44434933538.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f47f03a27---58717049328.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/42061422079.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/19001212968.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/vurakusatol.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/kixomakaguvi.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/11792844908.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/78e885719b9d6153157ed052575ce0d3/31843836025.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcf22decd---37973955274.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0b2539caefe6d5c0dbdacf293c3fc621/jijunag.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/78594830602.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094767ad060e---kapedejerotowi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/he8akioafjq6493hnq49f5gho7/weluvasak.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0b1f40b39---tapunebapolajolow.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c598e3be---88630216681.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/55643260635.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118c595ed2f4---bexunu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/eonq2s2qtoshldv0d5umtqm537/zibalejupofir.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/racp5abjvr62p8at3gtcvckd82/5826888746.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/7916528807.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080200bd71e1---jatedopalaranoviwu.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/58899092596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hotstar+mod+apk+for+pcPDF 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_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10492 bytes
SHA-256: 46549c24aed06e8cb4a8b0630249c66accf1449c928bedbb61dc7cc7d095fbbb
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 17564 bytes
SHA-256: c4e015ee40ee353f8f6901761181ed522d700f135298f3e3ca6edc2b5f667c76
font_02_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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