Malicious PDF — malware analysis report

Static analysis result for SHA-256 641de700ce5f86e5…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 03:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: cf8e53ae999db4c6c66264803f61929a SHA-1: 913b6f760cbf68540cfed33039e0dd829fdd5bbd SHA-256: 641de700ce5f86e57445ffdd6860546a086cb970a072e6bf343744648ecebde4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates that the document instructs the user to press Win+R or paste a command into a terminal, a common social engineering tactic to bypass macro restrictions. Several URLs were extracted, including one pointing to a compromised WordPress upload, suggesting a potential download or redirection mechanism. The presence of PDF-specific heuristics related to link farms and external URIs further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://oniceh.ru/uplcv?utm_term=how+to+run+c+program+on+command+prompt PDF link annotation
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0739b7970---tolagujipidilekokiki.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/32571530795.pdfIn PDF document text
    • http://nfc.soo.jp/file/95088397852.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210602_11462E2DF2AB742C.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/75931013611.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021812113543568.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4794f09083---30647350537.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/pewerewarorog.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/10058383158.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf388d186---5233241736.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/857b1bf4d1871782d830762d4944d2c2/garax.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/fawibakagunerunikafeje.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2588a4d7---torosoviwu.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/bawuwitowumovusol.pdfIn PDF document text
    • http://coachhouse.info/assets/file/66725284357.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/sowedibikefesijako.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/28037566706.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/83425004986.pdfIn PDF document text
    • http://effektfilm.de/files/file/85151376735.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e5d112c4e---fagosezevomuzutumovi.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a08f9487d---nejanukavizevifenakesexup.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fkubq7jht64nno6fursinfh4sv/52328113319.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_off0000c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 10596 bytes
SHA-256: 50fdbc42f1e47215f8654057626348d099cc458f3c4a9cfd9d536fc7ba3ef00d
font_01_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 17760 bytes
SHA-256: c2f55b37ec1d676883de0d7fbb4bb6f50a0a141eb8cd7b5a77a4828e14c97166

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