Malicious PDF — malware analysis report

Static analysis result for SHA-256 8159a3049f98a630…

MALICIOUS

PDF

82.7 KB Created: 2021-08-10 10:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab0400ea98c18f301e03689547c4e50d SHA-1: 6125267d4fcf1f2b7cd58464b1728436348e584e SHA-256: 8159a3049f98a6301d8d4fe078437cd474680bfe5b8f8c8544b985e44d19a5cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous URLs pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://medvor.ru/uplcv?utm_term=rainbow+vacuum+model+number+location PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b785b2d4a48---93013998436.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/nakufozolijekilovaxex.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/tefigalemirakiwako.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714143256942.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b885f49a9801def93f95e6ae59fa6fb8/55073303278.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/adlkgs387c48bdbpbuhk0f83vn/zurizumimizepabo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/zolarapojagaraxa.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/16331459673.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/6613015393.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/mekuzulamakevuvew.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c783e7e19b5---pijevagor.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea26548760---21884233866.pdfIn PDF document text
    • https://campermagazine.tv/public/file/79835176401.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/52a3df4e1cfff0325becaeb431292ece/67256144826.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/86e4127e2b1e5edb756c567d05cad399/59995172433.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/bizifefaduxevopu.pdfIn PDF document text
    • http://proxima-design.cz/files/file/81643074127.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6ba93c72---pimekarozedufow.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/db9ms611q2m1bemust01a9dg0u/11872250469.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/26250399747.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610adfe3743fa---95467219232.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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10800 bytes
SHA-256: 7ccaf9d7eac1425b5f0d1de84dc13b5fc8221cb7acdfcf828a607a8c0e205f95
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 17708 bytes
SHA-256: 3b0456dffcee753af44d4702d66cfaea65b0a31b71ada1d24cab681d7b8d6bc5
font_02_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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