Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07af35f520c2fbe…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 18:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e07a23f59842b7400baae53ad7abe4d SHA-1: 0ea5222df82e8d6270002ec82561031f34d30d8a SHA-256: c07af35f520c2fbe15a60dfa0f23a1edeee803e613ebde0f2480c91adcae1d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate it's likely used as a lure to download further malicious payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pasarant0g3l-turbo-h1t.com/contents//files/gorilijimifevixexidadodu.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c05d0379913---1760855642.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/jilufixenivox.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf238c7d67---kopulibonabutinusenajekig.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/putedezitu.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/48224844183.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/49480287616.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/55841376686.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/83792334555.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/dirumidodokuzuk.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/92581201883.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/6127572998.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/43793746968.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/92467725020.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/sidanerubaf.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fda19ea8---30045457055.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/nexawefuwajawur.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ask7b1m93tsp1s5tg3v4qp2ji1/96394488561.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sosufali.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7bb190fd---sanemegewefaxovovozipaguz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/79649304565.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cbb4387e5---26920971652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=eminence+grise+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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10520 bytes
SHA-256: 42c31e2bff7caa8e84aa0d42f5b0ff24cd710578de96bf36903ab4d7c6832870
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 20848 bytes
SHA-256: 2fdb0bdbd87204200b236f6ef0062880c5a574f8c7b049335b18269d141c3ea4

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