Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fbdb5ab28a2104…

MALICIOUS

PDF

70.7 KB Created: 2021-09-22 20:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45e9318f2acad9b2813f3552db69a9ae SHA-1: 69662c5a35b7d29e50c6953aaad6f05f7c475485 SHA-256: 85fbdb5ab28a2104a846056b0b73df2fb5ce5c011aee027e0f46ef5d2b0704a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://touristclub.in/userfiles/file/tudapexuzogelipopofe.pdf In PDF document text
    • http://rebizplus.com/userfiles/file/3429721682.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/zekikededuwokosozarup.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/zatidimamuki.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/wagagoporekugagizusudobe.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/95804412807.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/75452405215.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/86857324115.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/22113938954.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/66193619100.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131831f12ba5---nikomekimekevurivigotojir.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/69568282463.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/74726180089.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/tokepepisibabapibinemadel.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/91844263438.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109181845196578.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xepovojitapedebafa.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/73105727537.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/87303228016.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ee7897c9ff2bbe99caef84240dff34fc/vutuperataxegegaxumurot.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/96390274809.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/bamox.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a914ea96a---41021879546.pdfIn PDF document text
    • http://www.bash.cl/media/file/juwugaxijevilow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=savage+grace+full+movie+onlinePDF 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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16192 bytes
SHA-256: 95df86ac2be88515568a28e664bfe475c522c15eb7aa97d2ff14de62142b0da8
font_02_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 10656 bytes
SHA-256: 8649815807f30e57869a0effea4b12cc83a197a2a24a3a9fb027eac2e3ab7f0e