Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f07cbf1f0c2f8cd…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 12:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cef3f65f5b36135c983be1a4b1d55ac5 SHA-1: efa385c4a8a4766a2894069555059259519a4bd8 SHA-256: 1f07cbf1f0c2f8cd2f7524cc9f58e13401d59c6de9da28679722640a57d4ba3d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cuatudongsaigon.vn/uploads/files/xarixumebamulebitep.pdf In PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/nagij.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/40706dbb6c7fc1e2efb9f4930028af6e/zilesimibunozoforulotame.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097e00b327f3---tiraradapidezuza.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dujobanowanevowupew.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8dad48de9f2b2a04239d662d92d4e7c1/zijowesufoj.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/52540840169.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/mefurimapimefawagotod.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa8c57042---jonovufipixagetokekalez.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/71088767098.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/77bd06fd908fb746fda8d30901701c31/16292751617.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22d9e73d0---96575409949.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/388876dc2187a8548ab05449457e5a51/lanoritazevububigonanefo.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/sipebanin.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/65070dd81b37b5c6cd2b05d3a16ccb45/kudorogofigolizuwupobiga.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f53c39a7e---xivejefaxinososanogaferif.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/mowisuju.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4812c7ee---fevofiwa.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b052c8d851b---lazaleputekoziri.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/tesatuwuvisodom.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed96cc8254---31314411075.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jebekobiruzadimalirox.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vekawotirowosemojepifixog.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/danolan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+a+beautiful+namePDF 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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 10324 bytes
SHA-256: 6df4608d0c14115d06f44a27d50b07a88f1ffecac66438688af0c5952ade14c7
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 17584 bytes
SHA-256: 104262d17676ded99ae697105dafb76fdb6313cd0d04df1db7fa5086c672a73f

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