Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bac08e838c7cf9b…

MALICIOUS

PDF

79.8 KB Created: 2021-08-28 21:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f430b19aaa19b3d4209d2359682c271 SHA-1: 061692ee2f2e20471cfaf7789b7dab99e6404a4c SHA-256: 2bac08e838c7cf9b3d417e910827776b6413429f084a47f4d712f66fb048be9c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as https://garglob.ru/uplcv?utm_term=borrowings+in+english+examples, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://garglob.ru/uplcv?utm_term=borrowings+in+english+examples PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e529aa87672678f86972f63852378d28/lesagikipivuzu.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/26462145896.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716d16a7847---95633326339.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wowutikubovivununi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/bg1un28jml8b577i5k5cl11l8s/19112821159.pdfIn PDF document text
    • http://yilip.net/userData/board/file/luvugobojomef.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/kirukegakikafaze.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/rirowilemozepurek.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/27498611604.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f961a009bf---35297226269.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/68147502891.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/54581792723.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072502543773499.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/42941918022.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c696fb1bcd4e47e891fb41e7d46c19a2/26481037875.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609651dee8739---93898524373.pdfIn PDF document text
    • http://aimic.com/userfiles/file/dokube.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xosodomolojewarelipug.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lobepekimifiveg.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/25488438003.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fba102a2da7---59386134504.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b92df2699---37230556269.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/g1u72sd84iip5dihqn07fc1ira/jozolibovuju.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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 17216 bytes
SHA-256: 7948e56cfe78b2291ffa4da579831e815ab0781aef4f406abacf53733c6715b8
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10840 bytes
SHA-256: ce4463324a97b17941935a3cd0f788fa55d5edd04affc5da0b7376b54d09b629
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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