Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0224c259b27ee11…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 08:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc7dcf7aa32840105699bb858183a6e2 SHA-1: 7a5b06a0dde1ede7aeb38412bdacd72b52eb8710 SHA-256: b0224c259b27ee11a3e413b646f90e1b31d06a5a102c83118f156dac29367959
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=definition+of+management+theories+pdf', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/uplcv?utm_term=definition+of+management+theories+pdf PDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c677414f0e4---xagarivogerinoli.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a949cae2---bituxan.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/zavobuvufade.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/87969694611.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/sabupavorijaxoj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802facc8d8d---92970706576.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089243f584e1---25015055919.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrtmomn7ut2181etgauvbosqoj/ximomuranep.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/jotem.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/11729536382.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8ca487f2f1aa3def597ca04365363895/namazifut.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/29246259343.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ipf8n7sp83rtmqs5gm7tsf8hq5/jolukavo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867dd292fa1---94515580946.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39aa4250b---74477001685.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/17935690824.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/juzujemopetigerenadak.pdfIn PDF document text
    • http://effektfilm.de/files/file/lepagibilel.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/98573608520.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5879d816d44854cd59dd7c04c50dc6af/fudise.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/93786411076.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210609_0E8286F9D3F75DE0.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ed08426d5---ziduzamujuminemososiwi.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_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 10900 bytes
SHA-256: 26cd28eb48c98257444e226f7b4cb3aa268c858a41ca165a4c772c1a0a153e02
font_02_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 15520 bytes
SHA-256: 0e7251db24842ad086448071ff2d2173a6614c6b48ab3e24216a6600022c18fd

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