Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eb0be061857c81…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 13:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c51ca7c203a670da2601476bff98056f SHA-1: f976e559e60e485e47ca9437bece6cfcbee13af2 SHA-256: 43eb0be061857c813fcf4ca1da254ca8b07685ef6882a59c3fa4a56657b0de14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on potentially compromised websites. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics further supports this, suggesting a tactic to obscure malicious content or distribute it via multiple compromised sources. No scripts were extracted, but the structure implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pjkconstruction.ca/images/file/deterupibibesevil.pdf In PDF document text
    • https://bosgo.mn/uploads/files/runag.pdfIn PDF document text
    • https://teamcode.net/upload/files/jibejukidaniz.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/mozesazilono.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/63618801002.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/jufuwutib.pdfIn PDF document text
    • http://otczenacts.com/media/files/wexigelotet.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ajk8u5vto6l3em132ttjije2m/xizoratemi.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/devademukirobuwoxo.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/bapedag.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o9bcdennu77cuuc0h9qq3le6s7/dijolarutud.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/pedabosumenorebonajawuse.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/nugenal.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/22546370719.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f0ae29e4f618c20e38e6c81a3ef0b2cc/62276712380.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/lumobalejilemebogof.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dsllqg92gncgn42bhkos74n0rk/23402100811.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340e25dfbf8---97120969089.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/27792787866.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/zibuvetikulavol.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/50209123034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rotate+my+phone+screenPDF 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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 15772 bytes
SHA-256: 177d0e7cfc29661099e4920e57618d33a5ae8da5b42eefb98fe8ea230df9a19c
font_01_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10660 bytes
SHA-256: 8a3db8eb15f7adbc06be078be4c2c790ac41eee39c038d41bcc5da6c3ff100f7
font_02_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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