Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2548d9431169c90…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 06:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fec07b43a5b7d97b0eb55a5f0266b580 SHA-1: 85bad95ff77015aeeed622a13a89e795c631857a SHA-256: b2548d9431169c90a62287fbbfae7097bd4697797cb56a36d6844c65e69725d8
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be disposable or compromised, suggesting a lure for users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URLs are indicative of a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://health-bridge.in/upload/file/76812029412.pdf In PDF document text
    • https://czus-lukasa.sk/userfiles/file/45910097560.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/benuxotefese.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/85121574405.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/97260194241.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/pakolanabagixukure.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/41897999260.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/73950252938.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/kebilu.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/gogetewulumigipexowasa.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xasatesipirutasose.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/85b54855c1665aa158a0d2c742674c92/92263838675.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/xirixazapomiramizijufo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a33c0ec---45652851221.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/24992755783.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/61294217574.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/tapova.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/bonusate.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/4299079687.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/27301632815.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/60023110143.pdfIn PDF document text
    • http://swhos.com/upload/files/sonuxafulige.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zalegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+one+rootPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88392e6e2---rejegepafidosaxi.pdfIn PDF document text
    • 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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 9848 bytes
SHA-256: 3dcbfd7d89b0e81370c87b012605321cc77c5ae991661a17c568153d434c7ab6
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 17860 bytes
SHA-256: 328b8e66e7412f14e1747de3f4df62ef7faf6bc19271cafd0303ec37d65b3079

Open this report in the interactive analyzer, or submit your own file for analysis.