Malicious PDF — malware analysis report

Static analysis result for SHA-256 2652ae2b4c89bb5e…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 00:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8433ecd3bc43df6351af7f068f507046 SHA-1: b6bec50af5031802ec7f49cabd28118bcb76c3d0 SHA-256: 2652ae2b4c89bb5ec6e04abdf17d0042f05539331629a81ffaefb20b5ba2eb97
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of numerous PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://fence-alarm.com/userfiles/files/2258496493.pdf In PDF document text
    • http://handbook.hu/upload/page/file/78505275972.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210523232116.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/69659296764.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/nufigixejivibala.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/gaxakezekovibivijofinixo.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/21320489869.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/razopelofibuvefukobipoz.pdfIn PDF document text
    • http://fullx.net/files/61786090232.pdfIn PDF document text
    • http://sieuthibds.net/images/files/10892658434.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/jibaroninenumamasesuga.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6cc1599d---26753136051.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89f8d94d41---77504470716.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f2196511e---75480332434.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/xonoso.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/66144251270.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bff98197c---gizer.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd064cc22e---63448968502.pdfIn PDF document text
    • http://tion.hu/upload/file/woxonilaxi.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/fevimalezufizegej.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/24654778817.pdfIn PDF document text
    • http://koronowskasm.pl/file/10013659294.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/migexizuwajudujiwovofu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759c11c576d---48441604295.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/28681593288.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/jamik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=to+be+engrossedPDF 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_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 20352 bytes
SHA-256: f3656a37e028c3efee6dd6955fe36bb20cdf9d20c99f9551408e826271c6ded8
font_01_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 10128 bytes
SHA-256: ffa11f88fe3270c49868b6dcdcc7a0efc6e1c343cc95df780d859d1c63f241ac
font_02_sfnt_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1