Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97ef55b3d2259aa…

MALICIOUS

PDF

92.8 KB Created: 2021-09-03 04:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e4ec27f85016078e2732d42f95bdf48 SHA-1: 1ccfa1118af175a178fd09a2be088d5a1769c7b0 SHA-256: f97ef55b3d2259aa89460ac55fd03fe21b57e3ab75df390599beff6ebadcbf6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download other PDFs from compromised WordPress sites. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2a5052abe---sidikoxakirimineve.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1ff2af5b5---ninoxenuzoweraf.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e78f996---ladofukapaweposagixat.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/74388710443.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeeb9d6c43---31847159106.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q7s038k45mb5rgo61n9pqmaoh2/vewasemezemozarum.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/70971662334.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/43e3a5939c1e90dc820661e35e93fa7c/lafanadikebevezimawetole.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161263f25774a7---bukutarugub.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/deripogibusa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7g782a801p93l9pcdakghm6ll2/1210539263.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/dodaxujegekux.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/kaziro.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e599f7d703a47512a7c8dc8c2560bd73/59522112300.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/vamibupobubakixo.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/98918060942.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f79a41a2e68---sukowenudowujixiwasapow.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607648722f249---nogotibojigalu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44722614687.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/milakatisivinewatop.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/7231732064.pdfIn PDF document text
    • http://nfc.soo.jp/file/31085743203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=revolution+francaise+en+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_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 10824 bytes
SHA-256: 61b9e4823696c4d1d56a1e36f2a3383b77e898df3035b0c3b96ab2bb34f9fef0
font_01_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 21420 bytes
SHA-256: 9c6a47d82ac11e6a8b9eebf17525d4a8d259a28d64bb021d41649688272c4bd1
font_02_sfnt_off00014e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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