Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac07e34e165b8e2a…

MALICIOUS

PDF

100.8 KB Created: 2021-08-03 09:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7511a0b06b5968f4d356639835c49eaf SHA-1: 81b9ae66836dc15185590035d1c86680a2961f3e SHA-256: ac07e34e165b8e2a794b1e3fd98972a23dc45e610b7786bc0777528cca484c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating a link farm structure and the use of compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were extracted, the overall structure and link distribution point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://capmar.eu/userfiles/file/migonuj.pdf In PDF document text
    • http://collegium-connect.nl/ckupload/files/86873848438.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/roruve.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100c78366db0---wemumawegixaseg.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/490ccb1ce436f6fb06f110586acdbfba/gupigeza.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/runuwinewolinumirasigirel.pdfIn PDF document text
    • https://anakmeong.com/contents//files/77429984660.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1a1c23860f9e8476f94a31e8e2bf8f8f/2220250800.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/62779773301.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/13678926803.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/lelosativejoxazabazus.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/93370173734.pdfIn PDF document text
    • http://envigest.cz/upload/file/kutipowedisa.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gamawoxedilarelit.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/masuwobexojudozijag.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/46740277020.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/surifegej.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xutebilazutigujubusa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4d11d382331537edc27b2e7aebc1a9db/358632517.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/04a5bcf51e4fc918301e9f01a60d915b/48928546369.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e012d59861---4831915409.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f01b972f5---veselovefulavevimixof.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/84406812818.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/sodojudedavulexusixupoti.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9fe74ec0e300699d918b791797b07242/14479979506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+certified+six+sigma+yellow+belt+handbook+second+editionPDF 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_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18520 bytes
SHA-256: 53b61d55102bdcaf7f3e63b02a00cf9865ab1117875036ca97485eaf11809311
font_01_sfnt_off0001524f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 11420 bytes
SHA-256: b534a5dc85b94f94f7877c0479489ff7634a9b3b107d694ffa33e1e69e1e44af
font_02_sfnt_off00016cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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