Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b95ac9a7756a765…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 14:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb47f718616acc905c6c1f65d67422f1 SHA-1: 83fdaf629ee8832b58f82abd26e44f5667b39cf7 SHA-256: 0b95ac9a7756a7652a405c3e6e014a3b28c51140b36ab9518e1320471a3266e6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and URL patterns are consistent with techniques used to host malicious content on compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=the+black+butler+season+1 PDF link annotation
    • http://syntrend.critical.tw/upload/files/zakidizonut.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613383d0573fc---jumugogat.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/52766882884.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/notiboxu.pdfIn PDF document text
    • https://businesslife.com/content/files/revejiga.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sozozawi.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/wexexesunufotig.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/dasuxedaxoxos.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/gunelobazed.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/nogugodezumozir.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/83748844415.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/53876501811.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/5067163562.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614400e74ff41---tetaf.pdfIn PDF document text
    • http://www.bash.cl/media/file/28963710450.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/wolukob.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/28803040795.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/kolutiguz.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9q6v9ctigscsck6ajmj20b4ngu/ziruwuvuju.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/pugifipufofimoje.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/malomululegetolevo.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/xojoruzup.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ij4mi8irbbfvnhbebnajo54tn1/51746802403.pdfIn PDF document text
    • http://naviway.su/upload/files/87712220301.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/73365280857.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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 10580 bytes
SHA-256: cd1a90aa11ac4363003667951ebe2b8e4e99f484f431243e215b3fb079edc747
font_01_sfnt_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 14644 bytes
SHA-256: b72bc2311f5058d261e5eb4bdbceebfb1082d630031d2d16143a7f66b2ba7d5a
font_02_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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