Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d037988a4d24062…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 20:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 591366991abccf2faf684d94e1cb4d2a SHA-1: 990e412e0aa7c457d960177c995ffede7a9421a7 SHA-256: 8d037988a4d240625d6fa235df9cb4eb7952d390b15c02ef574054d1e2e40766
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to compromised websites, specifically WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links to PDFs hosted on compromised CMS uploads suggests an attempt to disguise malicious content as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/562303d54f47487cdae3276547a9d317/lijozofe.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdf5845fa---bagubexenak.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/vadiserikonofi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210528214445734.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/67544988632.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4aedac6c---80893203099.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/57085478906.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/19diik9t6f73skdsv9897hno03/lawurol.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/87f98597e5ebbac7fe1d1b631b906440/6059356387.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/01/file/20210601_062730_108.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cea64fa06---rinevowakulawigomokon.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vadadifunulazujog.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/56786732968.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/33951299145.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd01141df7---gebedipurupil.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836875c91e5---dufajava.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/fanatuzaroxoro.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/28421858466.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73797c325b---wumimolodujolovatekax.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d39b1ef97e1ec1438ffc9a17a57c9302/50161643973.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/42808254940.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jovoxukozap.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609621aea444a---mifawupikositu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=famous+medical+malpractice+casesPDF 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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10648 bytes
SHA-256: 2bc64feb2dee964c47024ed4022c3e6be37a02ceb040180d732c89c769d1dbc0
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16668 bytes
SHA-256: a89e89ab4ec965206c3bc0f92f10e5212ea6e592f2d4edb57fb399cea77eaac7
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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