Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4adc68ceb65f810…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 08:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea51a98e3ab5afd81801e40a41ec498b SHA-1: 38fabcc159f36b8724fd07a3ce86578d783b9f0a SHA-256: f4adc68ceb65f81097ad66ba528d682ab7ba73d5086819ea9150961131f0228c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to link farms hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farms and the ClamAV detection strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aae3329---10604870708.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2a357d27---20044740872.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/69996723798.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/jesaxezodovulakasido.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4743c3b1a5bd7213710f38279bd38ea7/wojuwilukolibawuzagaseke.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2424df211e---jokut.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xilosijurobibaw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16104ca1f67cc1---1961313353.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/49839292760.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1de84d604f760452949960c722ea8d24/gipavuxopazijevifun.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c389e5c04---pusutasofesomevog.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/49506468846.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160987782a6b16---nozukeledogimawonofe.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d8b76ec1f---jipelovijipigemu.pdfIn PDF document text
    • http://dalaichau.com/files/52086901248.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/986nill0lav2g9ltlead3u93c2/romagifitifabawulivujix.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/23739566739.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/gudot.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/xubulodajazaja.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/parafufawodaboref.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wosonuxe.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/30134609224.pdfIn PDF document text
    • http://caramelitos.sk/files/peranuromebiruwa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/01cb95f7c46da643b276c700d02f0e62/6222848253.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/piberulerubupenizuzugovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=black+and+white+keys+on+a+piano+are+calledPDF 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_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 10956 bytes
SHA-256: 6e2931be224421acd454085c4b2f2a6c6f1aac358d4a27169e14b3651be0ead2
font_01_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 17084 bytes
SHA-256: f3e4cfc86b821b3bf3df1f170bb5710d07e59d3a667e6a5d7ee57bf93e0c18a9
font_02_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1