Malicious PDF — malware analysis report

Static analysis result for SHA-256 52afa26ffb105a82…

MALICIOUS

PDF

90.5 KB Created: 2021-07-19 15:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b948d6e79ab2b70c2feda2e0a380192 SHA-1: 02a656a0ed6a209bf8e62db98b90c25489e72a4c SHA-256: 52afa26ffb105a82ea2156a0179ece207a3afb2a96cd35022372f4d031036568
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms or disposable domains. The presence of an IP address in a URI further suggests an attempt to bypass domain-based security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://akinmedikal.com/uploads/file/37949021613.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0551d3fb39---62341725053.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/51e1de4268fbe6d3a45b3972e4de8234/lofuzeremilamizetezumi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14dd313f6---29779112036.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/36516365419.pdfIn PDF document text
    • http://sowitech.vn/upload/files/57549015828.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/71973279032.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609246b607c75---jibemipinibedemigavixu.pdfPDF link annotation
    • http://jedwines.com/cmsCart//upload/file/23818041570.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/talufafaberegupapon.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/geweruzeniwefive.pdfIn PDF document text
    • https://blugarden.eu/file/someto.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/14946941705.pdfIn PDF document text
    • https://bonacorsi.it/file/86410470911.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/975d2e036d0878680cc939d327727391/viwototuwi.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/11681786492.pdfIn PDF document text
    • http://waterreducer.cn/d/files/mopifore.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/24781943789.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607454ca89481---lomole.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f780b3bd88---butevepip.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/39325072647.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b25cb2915---4064902418.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0255b4657---lewinoximokirefalujebemur.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e201ce6b5---37021536782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=black+beatles+song+download+mp3PDF 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_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 17544 bytes
SHA-256: 1072174b032845c3a22be30ea5edad3e5009d35858fc0784f7cf21f407564283
font_01_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 11208 bytes
SHA-256: 9402df0d0bb94e5fe06b2114df105672905e2386c45458526adf703215d7c7c4
font_02_sfnt_off000144a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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