Malicious PDF — malware analysis report

Static analysis result for SHA-256 61394cab0fb1a11e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 10:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f08727de4f224e68928b3ff7b69ec576 SHA-1: 50784bd51b35b3776a85359c7918e5a20fe31d17 SHA-256: 61394cab0fb1a11e71ca97579fcfe57f6ff1f10a67c07adf81a93b5e0cfeaf92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=colour+image+processing+pdf PDF link annotation
    • http://charivne.info/images/file/54112049903.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/45342003647.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/wulesulimiral.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/jixona.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/32459818432.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa350e102e1---sojuterexemamobibavokulok.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/88063254909.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a83ded32415---72118814544.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/52394341604.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/24855874898.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a2b7eb184---45520589939.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/14942938178.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3b4e28fa74ea94ca1160f78a7da5bdd2/36096285343.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/90464884517.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a06b3c5021---28573112953.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/duwojalerokikuvir.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/pizobu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc1d226d9---baredobarusexabu.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jadixopoxasaxixaba.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098076d58343---faparefa.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/zarul.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/pugur.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1626146402.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/54054944319.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 18472 bytes
SHA-256: e948da48f0c3b6565ae26ad73fb692c3e2f48f9581528a81bba733e6ad4a53f3
font_01_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 10996 bytes
SHA-256: 739415324a2edf91b55e0ca8dc21f958b579aaa7e147cae43df6027093e6571a
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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