Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ce027602bc1e53…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7a089f2ba9ca5ed95714d9d6f51281e SHA-1: 2aab5f659cc6fc6621f21c458684686d534e1b51 SHA-256: 72ce027602bc1e5386f46585370d4eb76532d23e0e6dd833ff4d2a7d4406f170
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to lure users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+turn+on+phone+without+power+button PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff10b46da7---84736593994.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ba588549a6282e800d8826847ad04736/41982787814.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910213754.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/giloxizomapido.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/38252135230.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/68284339692.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ce1b647b---99636875871.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/78215178123.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/32477780571.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/wuzowuxe.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/54529031985.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/snodiuv46tmic6v5klrabcptcu/62923520554.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310de9de90e---xajagufeliwibep.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/57988053381.pdfIn PDF document text
    • https://thepainter.asia/upload/files/pelokap.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bujikobamaforiwibabino.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/25438519757.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rekupigidagefinasaribolun.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/15846977211.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/futuzoxorefeta.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/6899141719.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/64652755843.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34dc91eb3---46151541712.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/24726319516.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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 10292 bytes
SHA-256: 9cf0cc279801ee7ec5ca20451566733e13d9c5856035355a12d2c1a070fc69b1
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 19452 bytes
SHA-256: 202aece92b92f640f657d3f71ef9d94c295f5409c62b59d0a6cd9ffa273a5566

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