Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68e4da04f0494a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 02:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4c22b462a3068e5268b96e5b513d689 SHA-1: 12d179b3168ad21ba618a818995768e100b09fac SHA-256: ef68e4da04f0494a4885c1ace27ce9c3c2dec40de5c59a6de4054d22ff5b6f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to redirect users to malicious content. The presence of PDF-specific heuristics related to URI and link farms further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=my+experiments+with+truth+book+pdf PDF link annotation
    • https://777mto.info/contents/files/radenujero.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/16729792848.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/11885669481.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/56512089627.pdfIn PDF document text
    • https://red-adlay.com/upload/files/30901972787.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/1913047544.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vuzitikokesawetuvapewisen.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/02937c2dee7f3c36473893ea122bc607/23700379439.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/riretuzeremib.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/dumimejifutilul.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/89246566377.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76843310750.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/pumowi.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/zutewuxedigafirurax.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f85c18ea907a391fcd9de3a7d01c56fd/niravedisituvokirotudiw.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b66169bd542cbe8870f3c7b1777781ac/93564756959.pdfIn PDF document text
    • https://dacola.com/upload/files/33957732556.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96076371278.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/tedowepokewalu.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/subabekixikejoso.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/15616862503.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/47931760046.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/24844579112.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/fonufinupofabamudewuxoko.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613a771a49e63---38974214410.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317354bf145---xukogurinubanapama.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 11180 bytes
SHA-256: 4bb743d2f3a20a068921c8466fc1704bf0505ca0efbfc1053e6526766d592a84
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 18484 bytes
SHA-256: af5745259f5253efc6cd4268eba27cd939be3716511abcaea6530686251e3396

Open this report in the interactive analyzer, or submit your own file for analysis.