Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05ab3e92accdd89…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 14:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 979718ba284f0bc91b16c48b3e2ee7f7 SHA-1: c31d0898988a2193727654a117f158607f8945e2 SHA-256: a05ab3e92accdd89b42c5764cdfae60a6b15d9e18ad21d796c895895a0236a17
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an intent to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vakantie-noordlimburg.nl/ckfinder/userfiles/files/160488441.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/50302969171.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/82bc0a25d2ed42fe51f10720412c523f/34996939892.pdfIn PDF document text
    • http://precisao.net/files/files/4788384890.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726da54585---91321212237.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/gunepuvapasinibituzekis.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/saxegimofexi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/52124093434.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/6269272752.pdfIn PDF document text
    • https://akemi.ro/hirek/file/58013811187.pdfIn PDF document text
    • http://miwon.vn/app/webroot/uploads/files/mowevalenafopo.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/19237030608.pdfIn PDF document text
    • http://webursitet.org/Files/file/tanitakurazofazapodari.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced0a862f6---10397035183.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/96668260867.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/jomunogumigoraxulekor.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/pafavovomilerawilefososo.pdfIn PDF document text
    • https://filetorme.com/upload/files/38660144433.pdfIn PDF document text
    • https://istanajp.com/contents/files/93950237371.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/8274452363.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6860254174---midibiwujap.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/bowefojujapiragibiw.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/gevot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=avolite+pearl+2010+user+manualPDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 10852 bytes
SHA-256: 79cf41c41cc309de9e6a57cb15233868662e78e70833c0d89dd40eded022c0dd
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 17280 bytes
SHA-256: df9c58453db1696f1d37e83949e97a9f51c0ab16ba1788a006309b3d7d7ffb40
font_02_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1