Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45aed5a8f796436…

MALICIOUS

PDF

94.7 KB Created: 2021-09-01 23:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3910ad1882394c8e37dbd93f85f662f7 SHA-1: 2c0cef87a3ac3ab16073f5a31e7d888b6297e0e7 SHA-256: c45aed5a8f796436f36daf516f53c5a4aea15ceaccbe3ba61ea52353be141111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db8aa0da091---jajepatasululo.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96b719293---detujezizebopenete.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea52e1925---buxoxewitemofalidafa.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/majuravojafarixazin.pdfIn PDF document text
    • https://bloc-immo.com/images/mupekomuz.pdfIn PDF document text
    • https://le27.fr/docs/file/kafarotituwuxofilerumomuz.pdfIn PDF document text
    • http://dsraxys.com/uploads/15312091289.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074584eab97e---vapafeb.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/94287898635.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/vebixadefopomurizig.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/0e5b800c19fcbebd9162fe4f6fa877ef/39097324612.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161274efc1acbc---9826864782.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210728031735468.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0e5198374---71189412298.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rktc6t011a04e6i9qg49429995/82272749222.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nirutuxozamonaje.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3f0671a---2421902284.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/naxadekululor.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/pibefo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984334970f2---92476433135.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/dafowubuwasix.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/31299929922.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/lamozoxeduxitokunoxe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6953li3sr70jfejdl1ctu0k0ue/gipiwavefutemebipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gluteus+maximus+musclePDF 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_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 17116 bytes
SHA-256: 6a5963efc838077553404fc2cf74da2c9eeb6223197ef0157f2d14441ff0e1e3
font_01_sfnt_off00013cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 10308 bytes
SHA-256: f8e5d7da9b473cdd7ef0a6afbdef1c3a1491f85a38413c3ac8cae7b753f4b652
font_02_sfnt_off0001540f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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