Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a2c5aa29a5124e…

MALICIOUS

PDF

81.2 KB Created: 2021-08-15 04:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83a30a18e76ce574498ea19bf9639391 SHA-1: 5807775eced3bc37012521787f8feb447b9be931 SHA-256: f1a2c5aa29a5124e21e484e856f0345f8c238855a1e1df50344a8bf44f7f7d2e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple links within a PDF, especially those hosted on what appear to be compromised CMS upload directories, is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160841562de926---39210679374.pdf In PDF document text
    • http://pm-property.pl/userfiles/file/30155483057.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/jijirazitivizikaduz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8c69954c---kebidezewegibexuputo.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/kixuvagobalemenebula.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bajinovinudir.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6dc4234b91463bb085994d8fd1714d98/ratej.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/64694404355.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/pibumowipif.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a233eb752---zoledo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1360bbd86---15655987980.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/93268629224.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/35429822635.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/jikodak.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/32515033629.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/88808382590.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/naxap.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/zalamegiweb.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/56a83ff0c5219da360bbe6737c6d6412/tolabitedikowir.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba26dcb8902---kixilamibutone.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/50141f5a34fe74ff894630c632ff497d/96999612932.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bexutijosobekizisunev.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/modavup.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55d196f8f---3834440516.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/zowitabemofojogisuxo.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/vesofupavivokuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+calculate+the+dividend+growth+ratePDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16736 bytes
SHA-256: 1603bd5d830ef305f2172771584faa610b06777e5dc5d9a4af9155c61fb54eae
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 10724 bytes
SHA-256: 4df0309ed981e07acdeaebd27863649bdaf74fb72ddd70b49643450e31cf5184

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