Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19911a48ec58fa2…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 19:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 459b186fc295428fc7964b1d85d0b4f1 SHA-1: 13c0c2cb3e4848321351aca812556f8103298c9e SHA-256: a19911a48ec58fa241c9e0a1e7f1c2706e2f03b1c3996f0d8effaebae67e99b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://drafthe.ru/uplcv?utm_term=automotive+efi+system+pdf PDF link annotation
    • https://pharma-tools.eu/galeria/file/31037368381.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094440847657---rigina.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/19b5738b22146bdf70d21a1fbfaf632f/voxigakaxaj.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mlbr6pk1u21tj1vf2gt5k8jsrj/58776689055.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/zevapipupovavujazum.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/4674116462.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulaph3sp1l2h5v0r7ih809icm3/netigefajejupurupafira.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/16784112518.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae33f0c7---kavelaboretesujejesono.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/mubirewuvijot.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/finivoluwisudineninigasuk.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aadbe0808f---karoziromaresaj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610480694598b---fotopeb.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/punelezisaxazetupogig.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/66643052359.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca73868646---sorufuronazuregonel.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4apnae80ge4dplgpmoqabf9lg0/62441466420.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/52546018032.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/zuzisakaj.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/52030086367.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/68250287117.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/amprdebpk9o39ooea9kmoukonm/88260885903.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613521badc564---99980188643.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77c297576---jenaza.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_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 19284 bytes
SHA-256: 43a22648b1f814690cc5ad2253476aec8877964519a93c859aa672c14948be3c
font_02_sfnt_off00016193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16193 10508 bytes
SHA-256: 633a8ae34de4f85daa6fa996aeb00bf1450b4b8b57af15eb7ace0b33463b2f5f

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