Malicious PDF — malware analysis report

Static analysis result for SHA-256 9939f7b0aa746853…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 18:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d80355b1834528d09db5ae1514da54a SHA-1: 3942170430cb2806b87dfe63a02e85fae56b8624 SHA-256: 9939f7b0aa7468539dd002d15f6fe50c0bebe425624fb077e3a82993064c2b33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised websites, designed to redirect users to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cc-loges.com/uploads/file/3539832605.pdf In PDF document text
    • http://xinshifm.com/userfiles/file/bibasa.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/44283187929.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/lotijolupiloroju.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/kigakepebalugu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/selonujutijozutiwad.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3770b688---falusuzemor.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/puditiri.pdfIn PDF document text
    • http://edituj.cz/res/file/90185646380.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161306b25db20e---45097910096.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b3ea7632e549bf9ab1b0cb44885c1b65/67202350483.pdfIn PDF document text
    • http://abnicum.ru/files/file/69983897575.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/nivemowezositominevovur.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75136914186.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/fixoz.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/66004039133.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/86552658431.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/93902603204.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399110a81ca---74723011152.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/65453538420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=empires+and+allies+mod+apk+2020PDF 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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10772 bytes
SHA-256: a56473b363df5ec6ae4f7ac4caee368b1dc030bae9172947cf99a714e2ba67bc
font_01_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 18892 bytes
SHA-256: cdff27050df5d1ac8ed49fc038682d17ae74ac8f8d6df969a4c1ae6693c95bc9
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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