Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb43cde1bc4c3ab1…

MALICIOUS

PDF

97.8 KB Created: 2021-07-30 12:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ad023208bb29bfd1935de6bfbacd15c7 SHA-1: 8dc5cfa0d750fe71e2db5e0cf8afd0b50127017a SHA-256: cb43cde1bc4c3ab1e524b9119e219d0ea4b9fbc0a7f74217849ef02e1f344f91
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0ee4fded215ce1fced34634646c6326e/suzek.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e552802bd56---63814304322.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608d918c4dca3---wubapimow.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/11966700791.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nhhb3tf1aokuu5lpt7d61l6lvb/35552832972.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/tozabo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bb77a9ba---lenudobupojopifunemut.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/51097374373.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/mufamawowana.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/63829607202.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae7dcec6---xevidafuvanixupude.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/38829499569.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/xukenuzuxu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28336lq4kc2su83asgm0q8s023/gegusizekatelemulilim.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098463a20359---96684388602.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/80070771117.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/9427629590.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/tuvelazafifebar.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3ada4fc4706a1485ffa5db4a9ff38e8/99558120083.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9fc10ee5---xebugimemovopesu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ffac021---pikosomitibutenal.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/420a59fcd254dbfd66ddf4489465d2bb/ditudemopufunitejedelaza.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9f8932af---65306790236.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608286e8d2b2d---fozunowa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/adec402d1ffa46bf0ec78d3c76a4b1b3/83466248770.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c19a2a98fb---wiwojukuvalarozujujifup.pdfIn PDF document text
    • https://petala.gr/userfiles/file/64046201048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+%24+5+000+into+a+million+book+pdfPDF 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_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 17316 bytes
SHA-256: 86bd51f5fd8b9be5119de5c2cb3a99b90deeb28507693f7ea5de93a2fc0e21da
font_01_sfnt_off000146a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBC 11232 bytes
SHA-256: 262db7cd1a7b240dc6001404a5e799b4cbeb79e389d490ec48b5e86ab3e19733