Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab785c6243c4ed3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 03:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b3b5e55d10ff8cd82097d8603ad3c27 SHA-1: 7fc983765129294ed96183ff06633b5a4ec8c02f SHA-256: 1ab785c6243c4ed346276921f6ecae91d3b692c78248505dac514d365bf94021
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to download further payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic specifically points to a tactic of tricking users into believing they need a password for an archive, a common method to conceal malware from initial scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=how+to+change+password+of+pdf+file PDF link annotation
    • http://katachizu.com/img/news/files/vunexulazoji.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/80526621471.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96dfd5482---duboxuxeluzorusuxowewugif.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/30970269480.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/momof.pdfIn PDF document text
    • https://ptogel2.com/contents/files/73931588055.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556a99a22c---16943954366.pdfIn PDF document text
    • http://kdekdyjak.cz/data/josufurufel.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kujafapigojezudu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f74d5536e3d69c7cca1f679a5ea7227b/92614681893.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/panefan.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fr8p9qc6qdogn5jlcqpnhjbrls/871176336.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/rikoserek.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/57839105471.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614516f91e1bc---popiwezenigipa.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/44487731890.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/dijinovifinogudupi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/refuwebapisis.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lejotig.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/xulifejukukegupadexewoku.pdfIn PDF document text
    • https://forssh.com/userfiles/file/tolosumabegotut.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/kefetitugafosuxapukom.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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16656 bytes
SHA-256: 853fec967a8c8add8b1fcd043b07ca2954f11b62b0c7b9a7a09d66213e32417a
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 10976 bytes
SHA-256: 32ead1eb1ff4d0bbde795e9a411dc16292741406b4a9813ed454f15c666a7a29

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