Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c60cb5d0b45a6d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 00:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7a6e715336ded91928b8d662a99bc22 SHA-1: 9d9feeffb0de25147a32a782e85ad7edc75e21b5 SHA-256: 90c60cb5d0b45a6d3426fe840871b07866b6382f0a4c138b35bdf511fa9ceb3d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads and disposable hosting, forming a link farm. The document body is heavily obfuscated, but the presence of JavaScript and the link farm structure suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dom4m.de/userfiles/files/73652319501.pdf In PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/zibijobofopiloniliku.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ft2u204u2sqclska95uj98h1em/selexidafoniwepowajiwizo.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/99079659299.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/gadozuvekiwarefofi.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/77844253915.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1c1b6fa5---fopisebotepofix.pdfIn PDF document text
    • http://alptw.com/images/files/foxazorebojabotedik.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/42094782856.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/minuxib.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/keparemaseraninelarike.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/95389428206.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/1670495739.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/fuwidezazugalive.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/27295374384.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/24652308856.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109062244023461.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/13498899369.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/39190861538.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/32d1bb9fb81541c9777aeb7d7347e998/62344225322.pdfIn PDF document text
    • http://mextro.de/upload/files/59087923770.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/15320659729.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/37084163844.pdfIn PDF document text
    • https://mimpishio.com/contents/files/21468902064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+lot+like+love+streamingPDF 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_off0000bdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 10592 bytes
SHA-256: 1e9fef10f47e3e4dcd9abb6f0118750bcfb2b9fd49cb57c751c0cd2dff45f61e
font_01_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 17204 bytes
SHA-256: 5634f710d22fd36b576c79dd8f43486779256ba6176624722f91ee418796b14b
font_02_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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