Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd42f55a52e1a4f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 15:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44996358cbbde16d8a3ad7fbc865175c SHA-1: 834ef3597cd095a8e0d7d7e6b1b6ce95891c1c70 SHA-256: 1bd42f55a52e1a4fbab445daf0d35a58980831cec9b7121b77ffa2a3e98d8d9f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with several URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bankerz.in/qpic/files/49259280611.pdf In PDF document text
    • http://websteravelandscaping.com/editorData/file/bolomusoverewet.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/82537989195.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/11836117194.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0b61ca94---megezitotewusu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4d6cd9f52b3d39d225de56af606d62bf/tamukosudurofijaxipizirup.pdfIn PDF document text
    • https://sim2007.com/files/zutafus.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/38963689205.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/33610482537.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366cc81ec1d---lamigekolere.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/jujuxitipu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161307eab1a111---vukelamulizeloroba.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a211fc973e7559df4cdab8f1a1b7fb2b/lavovevinen.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mamazurugo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/pigifevuzi.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/dedobizulumogek.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/63453827545.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/veweperom.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210911233217.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/12152014817.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/77832857475.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/80207073069.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/wovozaxiveloz.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/zanulemitegugi.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/19411021213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=age+of+empires+android+apk+dataPDF 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_off0000c43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43D 17396 bytes
SHA-256: c9bc6f99b41d9978cc74b282881ac850cd5b4765f1ba0905f3aab7f0e098d046
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10868 bytes
SHA-256: 19432582ea5be70c5801570602e304fa37a8414e0bb14afe39aa8efe8eaea59a
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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