Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1adf8fba7d1a9ea…

MALICIOUS

PDF

74.4 KB Created: 2021-09-26 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 120f7f515122522c38fb6115a75348db SHA-1: 49a2ade40f94d4bb111f07f4b58bfd56a5007e7e SHA-256: f1adf8fba7d1a9ea62632531c3f28484843803a75ed9ff2e0273124f1fe6da19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fabriziochessa.it/userfiles/file/dijefuvusedimov.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613773823e6f0---zoruvomusidub.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/muvabexize.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/dovonisedab.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/64012704660.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/vajepu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/nutavoxawixagogoworakifop.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614040db4a518---96183205457.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/55606691610.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca57d1bde---12286059178.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/69080295279.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/50154725470.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/jusizimu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kazoxuvezazopewegajax.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/68480310564.pdfIn PDF document text
    • http://metapolar.hu/tmp/zarukunadav.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139a37d7b614---vezobibuzoza.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/36478809857.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/dididajamugiboxijukifakog.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092218520710.pdfIn PDF document text
    • https://linker.tw/files/88862561364.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/7807184922.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/95e19ee532238548eeb323b1d9119ae0/rusitipijibovikibuwuripis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+recover+photos+from+stolen+phonePDF 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_off0000ba7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7F 10632 bytes
SHA-256: 7e81eb24f413ab83f7f397f4d8e3d0d6430c9a650687de8ae5b06799b192f9a8
font_01_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 19080 bytes
SHA-256: 387f90cdcd5dd1137db02d50d9c106baed59aea625e883995c29403ba566a3a1
font_02_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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