Malicious PDF — malware analysis report

Static analysis result for SHA-256 a195b3e1a939c1e3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 15:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17cd88c18234c22501d3d85b4a6b703b SHA-1: a500173cfab1f8bbf0471dafe024ec7b888f6071 SHA-256: a195b3e1a939c1e3d9d9c019b214507bbefcc62810dde445e3c14fbae6c10d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file 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 presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=android+tv+browser+apk+download PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2d338434---26057887363.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/17812049917.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/47416375671.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/tanaziniwibitizazavaze.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/pijidotixerogas.pdfIn PDF document text
    • https://alutat.com/data/file/lurilasemewe.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/8479646391.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/silelefafusunanomukus.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/vebadotigigarulumaxab.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/bujapukomuzijolujupafides.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/zukafigewi.pdfIn PDF document text
    • http://df-2.de/images/daten/file/25970976171.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/61089031579.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/ralol.pdfIn PDF document text
    • http://aimic.com/userfiles/file/55344954022.pdfIn PDF document text
    • http://thaide.org/userfiles/file/26977823870.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210901174901234.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/tuwufuxabitunobesidumibet.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc19a5226f---82877012245.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5dfea9c4e6a1c82c720259017e39bf58/pevezukewu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e49226f30ceebe8b77ff96111b916e1a/94313816423.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/retaliwisiki.pdfIn PDF document text
    • http://esen.life/userfiles/file/23203262736.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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10752 bytes
SHA-256: e1c057c61ebdadb324f4134220ecc082c1253001d72c691b11d6fe49c0873f56
font_01_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 17800 bytes
SHA-256: 9172b4cbbaa0c97883758d7caa8940128344d4638fec5718442d951c0e0517a2
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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