Malicious PDF — malware analysis report

Static analysis result for SHA-256 16067f3890300d35…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 08:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3ed9b212a04e42ff921f1bb3fcb496a9 SHA-1: ddcea6da7e1f4e350775fb0a43eec5057d3cf7a8 SHA-256: 16067f3890300d35874c81ec213d6ccaee9e1ba1d2ae0da5cbc03cbde3747a4b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427742319ea---mukopawikutugidevugixon.pdf In PDF document text
    • http://konakelektrik.com/userfiles/file/jopelavulabiwatoxulagevi.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/nebewedisaguvel.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/79456055863.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a16g7cnd5j81f1lo220oaqa0rn/zulesodiwenenabom.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jozusarame.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/45464610438.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/bagupometum.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fc227e86230115d67665a444c44c34f2/71091706581.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109201442455578.pdfIn PDF document text
    • http://progetec.org/userfiles/files/virisifufotuzulibilajudog.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161316aa15e839---banijujezeditotex.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/raxozovodurigazarizozej.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/xewegakasezijesifijowuwaj.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109161250546893.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/54285605704.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393abc4a6f8---tefunexamona.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/fojosoki.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/lixigerevitoxakam.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/tojomolo.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/50859074248.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/58492436079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+x86+usb+wifiPDF link annotation
    • https://mediaget.com/userfiles/files/37865324379.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_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10696 bytes
SHA-256: 9cd6c43b1e0cc0e70fdbcf81209686b11469af8ccdf9ef41cdf0c8ef91acfd94
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17372 bytes
SHA-256: eb0a48192a35a0e334613150e7516dcaa84ff9224240379856ca1f48c745ce75
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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