Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee537db7575c67f2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-25 00:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1afb5ad4e46b80e9adb5a70102d56feb SHA-1: 212d82b0269888132b20235ec40d1c9a0e6d4c7b SHA-256: ee537db7575c67f23a4781ea81cd3167d970cd3c0ff75655ba780ca86586ba5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the nature of the link farm point towards a tactic of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff708af40---10107775089.pdf In PDF document text
    • http://mbfeed.vn/upload/files/82686167223.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/60395588105.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/31079346204.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/17171366737.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/18659063568.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/28850357168.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1a5e5c02---71062279978.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/86670706821.pdfIn PDF document text
    • http://rayanchem.com/d/files/xaludaxagimimezopeni.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614143879f2aa---givirelagivid.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/sasomakanujewenuwol.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/71094264241.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/52118934658.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/33654540906.pdfIn PDF document text
    • https://avflash.nl/upload/files/80402337284.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/tosejusu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/gemetepub.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/5545735895.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/93123591187.pdfIn PDF document text
    • http://aa-nusd.jp/migubarejufelezigepiwisi.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/gupapuwugawavupojoj.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1898d55d9---nowonimimitoroxevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spelling+apps+androidPDF 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_off0000b842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 19500 bytes
SHA-256: cabf4a90f78a9ecffd1c5f29c2459f258077941136456139ae364f08fafea610
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 10544 bytes
SHA-256: eb34424212f8f4fa366cfedf01900ec5c5f884f942931aca24f53c27b37d10db
font_02_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1