Malicious PDF — malware analysis report

Static analysis result for SHA-256 a933526e0335d3a1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 04:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40f0ea07b82632ef3042969ecd67d5d8 SHA-1: 404574bc5820de637c45830e8bba810ab7ec656b SHA-256: a933526e0335d3a1c671dc5f72b0c85d98853fbd2d899dc6d05c75a85a4323e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the nature of the embedded URLs and the detection as a phishing trojan indicate a likely attempt to lure users to malicious or phishing sites, potentially as a first stage of a larger attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adb581a1ecf---gevur.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2eaa2f7d400a201afb352cbc1b1ab46d/foxuzegepu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/834eb741f8edd19fa10341dbbf179697/padodapusadamijobelisut.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bfc62264bb94539acf90003158ce233/bowuzedulodezu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/12144502672.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/poderotasezebezatafexen.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608050ff63390---60950839188.pdfIn PDF document text
    • http://megalaserasia.com/upload///19450565326.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/46795959476.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/69362180382.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2ff39f62---toxurisojotuvinisezu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/98683480085.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/f9i74a7p8ooeotu25idn93tlcv/rikukegabuboxegomidupox.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3b74d81d8681f056f6eec1916b73ab34/95175779565.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bufuvanef.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4fa7a57376e5ca346296c30e32cc78d8/naginizakuxedudukijufep.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e24f82698974cd6dcc3f1aeea2e9711b/80755512636.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/5202922330.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fitijefuvoruwotelad.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/74358269016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=incidentaloma+suprarrenal+pdf+2018PDF 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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16408 bytes
SHA-256: b910981d7d19623b44e9b7970f911edb74ce9dd2f84fadf4fc0973ef8f820b20
font_02_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 11336 bytes
SHA-256: d8f71f2e049a071b3a228f787ac07b8c5866def4909efa8a02af0c57a2c6a891

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