Malicious PDF — malware analysis report

Static analysis result for SHA-256 4102d74a7549613c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 13:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bee405167c1b3a2a46b1f2d51ff4a3b SHA-1: 9537b39c840e058c7ba2b50e3911edcb784d4f2c SHA-256: 4102d74a7549613cdb9440dc8edee954aacfe8f4fa9688576ca23037f916b53a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Disable

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, contains references to activating Office Pro Plus 2016 and instructions to disable security software, indicating a social engineering attempt. Numerous URLs were extracted, many pointing to PDF files hosted on compromised websites or disposable domains, suggesting a link farm or download redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://finliz.lt/i/File/teberixawarewizomitawik.pdf In PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/jexifezudekosizowu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/14887882302.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/vizejovem.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131da69edc4d---94583237794.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/kukemufezutokog.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/tipunulimopum.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/54079857610.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/ruzezawesaximanozasuf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/630aa40b58a7eb855c8a3fcaba75b35a/gaxowasowedano.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/19805887451.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/98029828012.pdfIn PDF document text
    • https://energooptima.hu/upload/File/litogexukonitakurisabale.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/22554249003.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/31764814293.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/44008478793.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/59912022669.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///xowenugozenodifixejizupe.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/60841747977.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03b101cf3---pedurinudisulusudat.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/dabobojob.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/01d6f3073cc6c37f01001539269dd323/37129764202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=activate+office+pro+plus+2016PDF 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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10980 bytes
SHA-256: 37b147850f8c196fc8a34c6da1d7503fef1794c0efd503e1a5e61463870788ed
font_01_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 19148 bytes
SHA-256: d36180e6fc92453bb7f42d60c0bff45c256b6702ce47862130eadd76933ccade
font_02_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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