Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43f5addda105d01…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 04:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81a0b052648b0af17d6efe8fb3f55eeb SHA-1: cc08e0803fdc93f221ef988e737d6700e707366f SHA-256: b43f5addda105d01e6a96a501f397ffff6530f384a62ce6a41a09c4a3cdc7a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a sophisticated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=fnf+music+arrow+android+download PDF link annotation
    • http://annassteen.com/ckfinder/userfiles/files/73329628703.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/pubefekubufiruw.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/totofefozo.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/96912826947.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/88498998981.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/22472881612.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/tulufuvowavokowunidesigoz.pdfIn PDF document text
    • http://halaljones.com/uploads/files/9313374984.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210914160104.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2ab464a20af5a6d0e1aafbc8f8ecb112/22940063055.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/pawevuxaku.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/lizifix.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd8aaf89---60217494223.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/galobesawose.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/59692687196.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/67366576631.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143936529ebb---kuwodigotowefodag.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i3d5eteac3pnfp32jmmtqg3j2s/gatumezarez.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/90326202794.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/49793234423.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/petiverejapubunepijebog.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/61821794371.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/91482225224.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/5014622452.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fbf0c19cc---surumotazujipekoki.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/91647419360.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 18676 bytes
SHA-256: 76e360e6d4cc07490024afa3ab0e289c21a8f8d20ebac137bb3158b7c9e5decf
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 10572 bytes
SHA-256: 30bd13d5c778e62eeabe59e252d9224dc72d402ba81f1ac79e1a0cae071c46b4

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