Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a2bf5fe9699e19…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 01:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcd2a2e4c89a2279154e4678bf38a93c SHA-1: 1ec9a3cd83709be4348dc3cd503e33fa2b02ffd1 SHA-256: b9a2bf5fe9699e198e61bff468693a441c59c3551e7ee659b2ede492796669c6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=windows+8.1+key+list', are likely used to distribute further malicious content or phish for credentials. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=windows+8.1+key+list PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/molazos.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/venovepefuvikobagoloruwi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/28552501430.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/45888371189.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/84136428912.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499fd959b47---zufivetugiriguri.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/20938820700.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/73839015570.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e54697f5142ce89d66be1e1909dadab1/xuretowugidezanu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614142ae25b01---jijozomujepilezironawir.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/63467122336.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/54506204346.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/2228290410.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/vulefokulesomesugixo.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/kofilarikoxusawemomerol.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b916b94c7b27770418f56ca84b5ace58/86449458886.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/17134835075.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/takifasunasakino.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161410f2fe4144---vilemumerivipovojodu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d1680d4---73627786395.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_off0000acb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 10588 bytes
SHA-256: a0ad68abd3766a565ec65c6e0f037b8e289bc383b04155ce95873fcc4d7d7f94
font_02_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16432 bytes
SHA-256: 715fd3ad74d9dd8383fb3e498967d67eed41849243eaf7e8fbab0a936b1c4db1

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