Malicious PDF — malware analysis report

Static analysis result for SHA-256 267f517c674a3b17…

MALICIOUS

PDF

76.7 KB Created: 2021-08-14 15:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 58ece13239248fdf45290bc107536db1 SHA-1: f68a143ea992847868a6b70082bcf25d9198e8af SHA-256: 267f517c674a3b17f3f2738e1f5e45c8162c3eae46866d61f209c2564eb00c0f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The presence of a link farm and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://incense888.com/uploads//files/202108051135552125.pdf In PDF document text
    • http://techbis.pl/files/file/78452869711.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bcf9ce9d2cc3448ed9949e21787ef09d/41705110253.pdfIn PDF document text
    • http://iknow.pl/files/file/12925434364.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/85304701099.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55546e170---20074037761.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160faf94b9901c---88635079117.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a409d0bede---78100821280.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/wififudabijizesejuzuso.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/vibibapavazupib.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/60231005421.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b252b692609---dixugabepenovumesodevo.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/turukabejokunojevusim.pdfIn PDF document text
    • https://bselink.com/userfiles/file/65650747401.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/tiwub.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/zowile.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe35d3ae7---95940507632.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/57555597046.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/63041523588.pdfIn PDF document text
    • http://qzgj.cn/upload/file/kuvurozukegapanemuxogu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071adc28ae3d---8405837869.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/85047421828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=spirou+y+fantasio+pdfPDF 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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 18216 bytes
SHA-256: dac38cddda7e0e5bc0c55242b684a14ed71e0d76c4740ab2e11f4a7ff0ed24b1
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10600 bytes
SHA-256: 494d3a73395e54694758338c5c6992bf5d0ca17e6462f82b16c0ddf6eac6a051
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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