Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b83928a3c018bc6…

MALICIOUS

PDF

110.9 KB Created: 2021-09-08 21:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b3f1bc0609acaa60b15d7cc3c627ecdd SHA-1: cbcb1681cdf7ec2ec974e74d11fd79c4337e61cb SHA-256: 5b83928a3c018bc640a3c10bf3217d1e8794926cffdfa3bf497c6d272374c717
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These elements strongly suggest a phishing or SEO poisoning attack pattern, likely using the embedded JavaScript to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://desense.eu/uploads/wysiwyg/files/45440710241.pdf In PDF document text
    • http://aygroupmuh.com/image/files/lamakabujopesubise.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/4134215653.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/48131578530.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/22895792217.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341446a2f99---zepomi.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/tometo.pdfIn PDF document text
    • http://vodova51-53.cz/files/sobiwazuliza.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f9pl8p0ajqtnc3sha8mrbclu6l/82566021728.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/71781948965.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/36014523535.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/94487607502.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pqju8l8e0idknhue83h6qnasb8/xetidedokavud.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/14499099050.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134500ca2e60---95294465664.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/notekagikujof.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/setoxunekegalu.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/55765220239.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/mugewe.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/76861393012.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/20440492194.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/xiwobuvejevibu.pdfIn PDF document text
    • http://airmon.hu/images/files/mibewegadavewajigopu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/1500409899.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/71517581203.pdfIn PDF document text
    • https://phukienbep.net/media/files/66920189892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sitagliptin+davis+drug+guide+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528D 16396 bytes
SHA-256: 504863453714cf80c9edf7aaafe04b73c3778220f3e0d544498a6d16877b392c
font_01_sfnt_off00017cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19512 10792 bytes
SHA-256: 2832ebc11e26c79db592dea35f4a9b326528ba11e31238f7c4b056729e691ebd

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