Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432e6c06f7df9b2…

MALICIOUS

PDF

90.2 KB Created: 2021-07-06 09:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93a46341ca9f15f3800914519f4ca7af SHA-1: c9056a9b7c2ecb59ca53f8e6c71a7ac880ae1ca1 SHA-256: d432e6c06f7df9b2ad46331cab3632a17c6b44cbd0e839333463df9d7fc1210f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=online+test+for+tenses+class+8 PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/due30hd1kl3v3h7pcnprm46eag/40720026357.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/662d591b96e69bc438cd507c3d00cc85/keluzubuwebalavivijezi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efe343a02---takoz.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/kejixaxuporeled.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/9587580876.pdfIn PDF document text
    • http://co-mit.com/uploads/files/43017194047.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871931de26f---gaver.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/75715795099.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fcd97f1e2---fumoxezogazu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wivamorogefijetafuvasizu.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fakegezibi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7c2046a0e9105a5d002936577f555025/953289098.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2ccdda152a409681bf60e423d8c6ade8/jitomixubegajotixo.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/netafeganorud.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/04e0a2a892568897cf438403a5765ab2/suzanafam.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/db9b460af3fc4cb71e17d79c1702ff63/13102012904.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mojinowugifi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/523cca1fb83e8e009568420cae9f41aa/33484816737.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8f923b24---66764040932.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/laxuwubokirepimanevo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e9pdc5tf23tr2903pc4pu6bv3d/wonazapez.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93b7d79a4---84796654645.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/tinutawek.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/dilapadadidatipiguradog.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf7e68e6d---39510695243.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e8dabff4f213cc1c4fed4926a1d7fcfa/liwoladunikolalifut.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_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 17604 bytes
SHA-256: 264b44bd03dfb0722b008b5a729cc536d583760cb1635cfa846557628679ff00
font_02_sfnt_off00014340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14340 10560 bytes
SHA-256: 6c125d50aeb847ace9e029fc3b6250e49c17078f00a62f45dbaabad2d668399f

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