Malicious PDF — malware analysis report

Static analysis result for SHA-256 79920d70b3b7bb05…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 00:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e18bcc04f7c00cfffac73e2914001d2 SHA-1: dadbc45ea9056c9ab8fd30c2551a34bcc0c9dd45 SHA-256: 79920d70b3b7bb05d63ec23965767a4e786a822f54cfb781b5f8c6b5129a7b58
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/70b9bc9f96d9f557897b5696725ef739/wokoxunotitabuniwipa.pdf, are likely intended to host further malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/22595030916.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7c880b8a9605a27a1324841ef5afd0c9/lebuwubulusixezulepipat.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a767389d54---getelasosu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/nazodejexej.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kadolexut.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74cf175de---mamabedox.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/sanuxaruzotaxidevakumag.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/19571859521.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nqrc4l1jmvci5rjrrl7rr01ns5/nitat.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/96730958651.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dufunidileroboziwogume.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/noligejepamekemog.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/fokozitesukimimalini.pdfIn PDF document text
    • https://rintrans.com/files/rugij.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/70b9bc9f96d9f557897b5696725ef739/wokoxunotitabuniwipa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607996330b9b0---timuxedumalipedeginuzox.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/63332872579.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ashsnca9f9s2v1cugthinlms6k/26222814489.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/bb26d345eed11cddb09a4feeca905362/80843328397.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/84908395607.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa26303f58---fotalobumesem.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/11c72036f7c0626d102476d000b86048/govasulikadamedijar.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/gerobutamajogotajijo.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/nerobiratofaxezugolaguj.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/30e40b2036e500ca5639de4fa487b880/49117115674.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/56074216056.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8df22ded---wiludakifefulutexame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=data+structures+and+algorithms+using+javascriptPDF 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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 19272 bytes
SHA-256: 36068a570dcd7a23476774c4e37621d50c58079e56d606b0513ecfa4577787ec
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 11256 bytes
SHA-256: a9c97fb3b19eaef45f22457305a046b7e60d469312ef0d1c8cc5d3c9eda93216

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