Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec112450c7309dbe…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 96e4507af32adfc155eb1a3c54cc765e SHA-1: 4916ce7f376551e2bf5a7c6d364ed604052272a5 SHA-256: ec112450c7309dbe738d7db87fdd345da67a45c7157cb995bc5c3c9722b4828a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=how+to+get+song+ringtone+on+android PDF link annotation
    • http://watchimport.eu/userfiles/file/rosogalisitafeterutim.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/zeduzu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133376bda6dd---jojexexajexagupazijabe.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dofusarulisogipodubewos.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/77790522171.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45d04b387---nexudaxeni.pdfIn PDF document text
    • http://zubrcup.by/files/files/99741120360.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/809ee6028cd833a74be9fe62a7c34d9e/22607576866.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/2782663514.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/93827450528.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5e0c1e7---3480198787.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/xobezewokatamelinibezovok.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/15797067547.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/lufid.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210914_115104_181.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gutegowuwuranef.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7af0bf346248e16569943cca6911d541/82865303429.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/58974064242.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/muzowupabozitipuwi.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/bateridikukaxojovagosotev.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jaxakanigasunafevixera.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143f911d8afb---nikamojegesi.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/dijobu.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/47275858840.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/98332601353.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 18324 bytes
SHA-256: 816c17ee1adccc57bfe6903d0c0c17505fb8d6c5f760c88cec17abab88330964
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 10456 bytes
SHA-256: b964e759c285176cdb9ef0321891a72129585b4f92ccfdf76dd4faa2cc20b628