Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ead47fbcde73b67…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 22:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51ed361d5c1065ac240b6651ee78b693 SHA-1: 48fda04401b70451f375eaae98fce606a01206cc SHA-256: 0ead47fbcde73b678d0bb59241ac287460d1845664f28d71d7c2fbb9ac875fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=android+1+com+mad+skills+bmx+2 PDF link annotation
    • http://www.multigacos.com/admin/uploaded/fck/file/74267293758.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161469a2ac9480---piguwileretebavaverari.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/funani.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/pepagezure.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/2750646867.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/fukejutetokonavo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902200413.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d36f208c06db891f196448bee76bb2c1/xunopagujomovolebo.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/63145792195.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/zibonumugolilagobu.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/bixowuma.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6dd00ce6---paxovugot.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/losediri.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/92304214535.pdfIn PDF document text
    • http://lagrupacio.cat/file/tabogejibir.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/98112895925.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/tujezoreliwipot.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/losujosamabefumebej.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rejarevonosukutuvivisasid.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142981f33352---durabipufipon.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/gujosibunasezelakevoko.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/wesepifiwuvu.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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 10788 bytes
SHA-256: b0a4737f82df5768d02f696be9d292250790c200c7ee3c3279bc5c14017556a3
font_01_sfnt_off0000cc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 17608 bytes
SHA-256: e53a0bc9e4757155e6ea9c54c7a60ab76d74a33123c4f69919ee4b76b367fa69