Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38fd8c560432b09…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 07:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d950c786a32524488c1717a050a11dc SHA-1: d5226e5ce6a60d933e070570aebd6d076b52c989 SHA-256: f38fd8c560432b0998182cf99f39263cbeffe6ef947faf9f86c03c2a2b3c54fd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs, many of which are unknown or lead to suspicious domains, supports this phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bfr-bialapodlaska.pl/userfiles/file/valovirepu.pdf In PDF document text
    • http://debeight.net/UserFiles/File/96992027645.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210906_3DA2B1E5A2EF46AA.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/rimavozamit.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/72655133259.pdfIn PDF document text
    • https://umutfm.com/resimler/files/gokitupif.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613979092a521---legalajejopufuduf.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/diwinelenusajereputerepi.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xozetevi.pdfIn PDF document text
    • http://superazs.ru/images/news/file/20382172098.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/1191251790.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jaxute.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614326675228d---nikekovadebipukukuxi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nbv2j07bjqfdu97op3uuoqn9cd/josaxetiv.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f5f6f3f4e499a43acd24636590769a46/mevazaxekowepegar.pdfIn PDF document text
    • https://aildf.in/userfiles/file/pitesidewija.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d985538b7b---furegekewiluta.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/botuzexusuxidoxatuwejod.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/64066131509.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161418da4cbead---nenofinarufatobunuvib.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1683681252.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/fopavus.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/73522960268.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/47645721047.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c685e5d05---46537174810.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/99154784195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ball+pool+aim+line+pro+apkPDF 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_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 14720 bytes
SHA-256: 048c4ef34ed4bd42a32203e2fac977d0d60484a8c3772825cae282bf8c04c217
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10292 bytes
SHA-256: 5fa39f450f440716f699e5656e9a22fe81325cd16a2cf890d9eaeece42817e4a
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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