Malicious PDF — malware analysis report

Static analysis result for SHA-256 031f6abdb72f14d1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 09:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64b41b00784b601025ad264bd127c0ba SHA-1: 783fb50aae9f61a75e177f7619f16cb9d99d847e SHA-256: 031f6abdb72f14d1451e8d3bd5d4c43a5faa5bbc5545ca0374a52fffce9f83b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=rna+codons+and+amino+acids PDF link annotation
    • http://nhatminhtrading.vn/app/webroot/uploads/files/56964884732.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/33355561671.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/78933972101.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/59070641946.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/33639465026.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/38441362399.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/loxijubilifiladetibegik.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/23671733594.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf559f2df---49202025277.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901062149930886.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kabege.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zitorutewipefovugokuvek.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/suxojuwoferetezaraf.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bea5ed3fcf7f53b7e889e3c4050f2486/98165691058.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/ziwap.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/12609820226.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/67605335065.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/40899107333.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zivafixedomebugututawiv.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/39505444950.pdfIn PDF document text
    • http://chinalabware.es/d/files/7370563665.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/mazesusax.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/jomukoxemajexuri.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025a2d431a---gutanafabosozikopu.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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 10200 bytes
SHA-256: 311ed41cb111d1456e50c2007dc94fa3a9088fcc591023a760a0ea8e13cbe33e
font_01_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 15176 bytes
SHA-256: 89e4624e69a192404049b013c9f832aaab867b5a1c18510ec37dfde7361b1128