Malicious PDF — malware analysis report

Static analysis result for SHA-256 de76fbf62bb589aa…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 13:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dc8916010e9fc7ef06c6314cddfa34c7 SHA-1: 2d74e57135dd10c4c6a44573f82216dbc9050ac7 SHA-256: de76fbf62bb589aad1ba1b63871aae095557fdabff6153a1356c35ede4005c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=2gomovies+apk+download PDF link annotation
    • https://cosplay-expo.it/ckfinder/userfiles/files/24877919162.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/78064786188.pdfIn PDF document text
    • http://e-sheremet.com/img/51713795739.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/76026588582.pdfIn PDF document text
    • http://foodchemsino.com/d/files/dupapexulinuxoluduxej.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/54545979639.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f484449117---60962074135.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/sarawalelexarariw.pdfIn PDF document text
    • https://mytopics.it/uploads/file/nakomabepuliberotapijuz.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/99545030170.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dikidolero.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/viruvox.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffb27f8bc---81783472323.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/h1cbuhc15683ngtfebjs6k6r69/27332504470.pdfIn PDF document text
    • http://protok.pro/upload/files/fuwiwetafojidogikupu.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/21750108838.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/tedejodidam.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/nunowoduvitu.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/vafowi.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/1233931008.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/27013891698.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/84740225795.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_off0000afd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD1 10804 bytes
SHA-256: 7230a3a09c9d11b778c5becf99f05694f1b291a285c2b6d704d2482e446f01dc
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 16356 bytes
SHA-256: a3bd5bd9eb640a2f30d295dad2e4be941bcfd45a25ead6b3faaa0f9c87a9f2c2
font_02_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1