Malicious PDF — malware analysis report

Static analysis result for SHA-256 2890313d8f6fd399…

MALICIOUS

PDF

90.9 KB Created: 2021-07-09 01:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee6dc7beb4530ddeade9a586bed18038 SHA-1: 047d91197977958608bef1babb1f9bc7967a6a09 SHA-256: 2890313d8f6fd399bbb942e9202df3c6dc9f7910bd4408dd7638a556d94856fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smart-ventures.ch/upload/Editor_Images/files/2265393388.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/76abb4315360d8183fa727ec04691081/25233641024.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/20999774190.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc18e7659e---godolevonozalabukorozajob.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160847217e8128---52405668683.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098925579c82---34941908568.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071144a89676---tutovunokaxinoluf.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210620033244_ot36ai.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b48c4471b6ba732ae576cce1e38a604a/varuxevudezudagenumu.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/20243851580.pdfIn PDF document text
    • http://mopron.ru/upload/files/82906281705.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aba5918ad0020110ac4494074a4b4bed/46072242481.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df66d87b4---letipasotiborim.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o26a9imib5jjst33bvp105tk14/mabiwivaravufotufo.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/retek.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/shbtkf4568j39pb50vsghslhoi/gorosatowutikomen.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/89293855445.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/bbekac85eqnnsndul1vsl710fd/nivema.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef074b8a42---93675654750.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7ecc516d5---xowalalilewavaxonimapose.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a152947e562---xexilukexegibemoka.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/97710746830.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0e35d16f6fc1c3651231614c05252afc/78153571.pdfIn PDF document text
    • http://texmet.pl/userimages/file/12777865310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=verbal+aptitude+questions+and+answers+with+explanationPDF 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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 17016 bytes
SHA-256: 973997dda598b9a4729e093d0f044b742c349bb7aa96f9ef231ec9f1d2634d92
font_02_sfnt_off000144d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D8 11032 bytes
SHA-256: 7f131279959f7ee131a4aa2fc9b4b7aa71a3321677e373d383455d05d79b8c17

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