Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a5061dc2fcc388…

MALICIOUS

PDF

83.9 KB Created: 2021-07-13 19:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 40c715cc8e443171882e74e9fc32cd69 SHA-1: 962d2a3d3c7e353c1e0540e6b6bb4c3ec587dc61 SHA-256: 07a5061dc2fcc388298315e0b7e59e91a5a1f3f6efbbc544b0d5d0e6a73fdbba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. This pattern is often used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://porterbrothersltd.com/app/webroot/uploads/dufoxebesufema.pdf In PDF document text
    • https://dm288.rs/slicice/file/selesefuj.pdfIn PDF document text
    • http://innotack.com/userfiles/files/nomutenudow.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pp7kr3sa4vgb2jskle9mn66uai/31070177346.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/93864486550.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8c65de26---galejegirudugumekun.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/naresikeg.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2fbbdfd38ff123b710c52e99a62896d0/lopudofojofezikinema.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/653b4dfd761d216347df36a9a9d90148/25513681334.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ce9c3a002789ab8ef287a7ecf469ac5f/gegixuz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a782d17076---35355801797.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/niferuwijenofemefukute.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/lufusosapovaza.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/jevoxibesi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160989fd83e1c5---53313660812.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7e3a631dbd6f3c0cb8297187f4aae3f9/rorosos.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/77970463578.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44e25151d---21968608786.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/171801283.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609040fcc3b8a---62812441857.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/kiludide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+the+roots+of+a+polynomial+equationPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16916 bytes
SHA-256: 8b2f00daf4462f0ab3c690e6d3269a55731aa0d6a6280a74df07cc3466720b2e
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 11240 bytes
SHA-256: 34b81af4e089ed11fcfdc628279797fc81e472b8c6b9c47d82b2b5e96333fcf4

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