Malicious PDF — malware analysis report

Static analysis result for SHA-256 805a9ab0b608fc7a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 15:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2793feba132bbcd8886b848f99281e5d SHA-1: 677994ae30d0913cfe0b49cca15e379101ea33ae SHA-256: 805a9ab0b608fc7ab87872a497fa67a73e5362d4351067af81cfafd31c28169f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. 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 embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=toon+plex+dragon+ball+z
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161357b21cd5d5---54585374315.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ff9891181354c653ab10605807e2c367/wosixizufi.pdf
    • http://synhbio.com/upload/files/86353829373.pdf
    • http://airelimpio.mx/img/editor/file/75363921431.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/68750213584.pdf
    • https://emartdeko.pl/galeria/file/27635258308.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b998f5eb---72443731548.pdf
    • http://crystaltrade.hu/data/file/17007701391.pdf
    • https://full-flavors.com/img/Data/file/61170020921.pdf
    • http://simsvizag.com/contentimages/file/93340461004.pdf
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/73749168277.pdf
    • http://ph-easycome.com/userfiles/file/laxofuvafigidow.pdf
    • http://elementyzlaczne.pl/media/file/bamakenivakogi.pdf
    • http://kraemer-duennebacke.de/files/file/84250723295.pdf
    • http://st-johnson.com/Uploadfiles/files/bujiwajiwedafosozetibik.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379e8a07b53---35256507019.pdf
    • https://asthasupermarket.com/userfiles/file/dopiwetus.pdf
    • https://istocdukkan.com/userfiles/files/40236123064.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161344f108acad---20138234405.pdf
    • http://londonjip.com/userData/board/file/tivedafawajuwoz.pdf
    • http://location-appartement-venise.com/italie_documents/files/73593755589.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4dc67197---bivemefopebelejufodig.pdf
    • http://imdmotors.com/uploadfile/file/2021091110321851.pdf
    • http://word.mn/uploads/assets/14464559311.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d7.bin
821a17faa584221f98861172aa86a50e334772198d24847bffc390f0f097c821
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 18012 bytes
font_01_sfnt_off0001039d.bin
3edbcc809a052783613051dd7793de71517de9053658dd870c6140916db5e63d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10472 bytes
font_02_sfnt_off00011b1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes