Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b8834b42e7c113…

MALICIOUS

PDF

95.4 KB Created: 2021-07-17 16:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a840c1b2e2a38356d25de2516e8c956e SHA-1: bf5588e9ba9ecf52d14524be07b351c836f4ca80 SHA-256: b5b8834b42e7c11322a79f07cc13822db0f7084c35589a9c410f761b86930994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrusted domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f5afdda571a87c204d141368ada4493d/29457787045.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/24c239a13084c5fbca33dd7a64dd1e68/47263636166.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/badovinabotemeb.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/384f0a36e8579a638c820c763cf74571/30749258445.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/dotoxefewuguzaxoni.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/499906594.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/16490908078.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b163baea0c8---90743647971.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a7508f20504066168c10ca30ffea2661/72175293461.pdfIn PDF document text
    • http://farmina.ru/uploads/files/guwamogepipevizixumusuvo.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/37066871526.pdfIn PDF document text
    • https://airbays.com/userfiles/file/jomujepatimafodavafo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/61948073303.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d7e4a05f---gumemi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07bebe40e4---68286940828.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/40492414301.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/89245229629.pdfIn PDF document text
    • https://drlanda.hu/user/file/6103014254.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/8959217494.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/62104344542.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fb467f3d9---kikolagumibezomur.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/18803766930.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/14342424896.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd799ab2b---74127844727.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb82a6be6---xuxelowosafuxivukisud.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/xinatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jira+multiple+choice+questions+and+answersPDF 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_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 11104 bytes
SHA-256: de96784d9e8556e170a5e15ac6c65b72b6441f9113f4872891cb8ed536744109
font_02_sfnt_off000141bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BB 17716 bytes
SHA-256: 579127dd07e6e17f6bbda98148c2f1109a954cd4745115a5e5c056ff37cd888d

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