Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de4c98d61fbfa7b…

MALICIOUS

PDF

66.5 KB Created: 2021-09-27 22:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f0797a49c9027c84549e7e6431ae96bc SHA-1: 59ff5362fb471439ec16138498f7cb93f975b7e6 SHA-256: 1de4c98d61fbfa7bc375c4f1c979be0dc2e9322e773a91be20f715a6521dca9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farming, likely to distribute phishing content or malware. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6183

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=android+emulator+mit+bluetooth PDF link annotation
    • http://inter-travel.hu/_user/file/80276509843.pdfIn PDF document text
    • http://surausa.com/uploads/files/lawejimoboxasib.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210918103127.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/49542791992.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/nosera.pdfIn PDF document text
    • https://bczenekar.hu/files/file/rosorabopuzedizurolo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd1241a49---botowinilutebata.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210906022821.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/13247099830.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf26586fc---besekukibuwojozozubidog.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/50211740096.pdfIn PDF document text
    • http://xfswchem.com/upload/files/93647973095.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/78169200656.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143f849e12aa---78382071546.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/bokojimugane.pdfIn PDF document text
    • http://eva.am/files/2ec795a4ebb673fd.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/leruvezoveledewujexatix.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/lezofadekisudo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d1459fa754bf7185846e5d801de9e9bf/81967184302.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/nakigasisejimowabadoke.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a508bc91---jilopiriremagup.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e68786a0---59300026533.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/vonapijejuvojew.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xipivubalaruwov.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/40112952361.pdfIn 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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16900 bytes
SHA-256: e240654e579e8f4042223b5f4efd6fd895078a4cdcc24341d5572045ee6bb148
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10568 bytes
SHA-256: 3794dc6a8f836a525a00c550d5ce45dd0f57ff28710692ce4c5577d5553c81a7
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1