Malicious PDF — malware analysis report

Static analysis result for SHA-256 6043812f991af5b3…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 05:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b3d38f6460f8fd8adc8710d87bd2429 SHA-1: ed8aaa957f81ff7f4c887fc5674501c435f6299e SHA-256: 6043812f991af5b3fdd497cd6fab2a686f1cd761305e10694816ea8ccb9593c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to lead users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=android+remove+update PDF link annotation
    • https://quatden.vn/webroot/img/files/20865313696.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/pisazifunodujuwuf.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/42175671465.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/74638513251.pdfIn PDF document text
    • https://parfumzone.ro/files/file/74632088536.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/42671215711.pdfIn PDF document text
    • https://makenie.com/upload/files/14897124886.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/rutamojabomitivuwan.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/281f1aafc2dcef948e5ff49583d76e2f/mabuvebugejakisoki.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/mukoxakexejebepaturipij.pdfIn PDF document text
    • https://aspirans.com/files/file/29975930909.pdfIn PDF document text
    • http://centrons.com/uploaded/file/69922480261468c29e9f92.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a4f74e6b9---61292704024.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/82117755487.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109130801447964.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f0b1356c0e6ee5bc36048ff7edea0002/4799569818.pdfIn PDF document text
    • http://zerosquareonline.com/file/22232003644.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/925cdcbd71b67e09b4c2b95593c07753/82961399070.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449711f362f---32203838709.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/97427195912.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/17116768198.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/93837087195.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/zidigonixiwowokuvaf.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/80095174742.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_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10484 bytes
SHA-256: ab087baf060b059e0e7d2d75d9d476aa96892a4c5cfe757e2fd9e64b18d73a6b
font_02_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 16752 bytes
SHA-256: 05c4c2724de82bf423f10231400bec8620e306cbd0cf9101be674821ea9965c1

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