Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb37ca4bae6fa815…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 17:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffa904a6b49092994e045eddb5d9b47e SHA-1: 7aa1618c5b2453dac82f38cf499c8593bcfb9ae6 SHA-256: eb37ca4bae6fa815702ff3163f4db899e4e7f65e36151cfc7d7ba3474aafb065
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://charterfori.ir/basefile/charterforiir/files/gebilukadiripibulalujudu.pdf In PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/sebagexadez.pdfIn PDF document text
    • http://net-marketing.hu/images/files/66970667864.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54031427488.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/bugirajigenapebobuw.pdfIn PDF document text
    • http://chinalabware.es/d/files/sunosedomitanuzodu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/97006411105.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/44279617837.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8269319da---bopavojabevesuwamim.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/29368209034.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64899594164.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sapaxamor.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/boratarafesasuguli.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/lakutixomoso.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0eb9bf86836a5f151952d0b1b28bc25c/83752372265.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/57179209343.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/75361038922.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/56467920928.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/suxagol.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/46891101578.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161329901b38a3---vunasez.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/fosiburipubipoxubux.pdfIn PDF document text
    • http://popmetre.com/news/files/losekudu.pdfIn PDF document text
    • https://duvanco.be/docs/files/kelipunenexusuxusunuketof.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/64898977699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+app+serverPDF 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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 17180 bytes
SHA-256: 450187bd9d5222076b0350a7f799dfb377877297488c0892fd5548f090a91b1c
font_01_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 10288 bytes
SHA-256: a848e6c635bf1d788e656eb0bd7d0f2acd5cbb44bc5250a8ac301de4be55fe7f
font_02_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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