Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4965366ad20a7c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 20:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ab0395ec16bf124baf4753941a5b740 SHA-1: 64a1646c2da1648f54096a81333fb2eebb5df3ca SHA-256: bb4965366ad20a7ce3cf1ad8293374ace4e0ac3c3f4ea2bbec536e0505468c92
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file likely serves as a lure to facilitate phishing attacks or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=coreldraw+to+pdf+converter+online PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ae053a94b1f5a035b0d32a0ed3b1d34b/35547310314.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b89601a5337---lajulitokazolarapi.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/litebif.pdfIn PDF document text
    • https://termoformat.md/img/files/37131487274.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/kogewinadinenugotedutaxel.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/94719434121.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40f16762f---birapojemulin.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160db3395ace49---mopilo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c612dfb55ed---45139348202.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///59422259132.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/menolekaperukopogofotur.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gividogimodimofawenidom.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/92c285e65adab16d7b18acf8074b1f33/56263269222.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901025858.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/57819663458.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/pefurudisapuzumofuput.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/zunodolitikim.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8c107805---bubomuroxu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe3cf4da1b---41308683301.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4ec0b5c0d35ba3bd8fe2ccd5d2ec08f7/44515077144.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/44406122870.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/88232630045.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/pubidetumadaduvadaxode.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0gfn2bslgdtubgruqt2jju8kd6/2858160887.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zamokofukorakibafadoza.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sivukigesekoj.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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 10628 bytes
SHA-256: 9bb2c87095ee1fea179a27a7b1e7c6800cf83217771b5da9b794acce760f640f
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 17664 bytes
SHA-256: 00db6ca55108e224e698186ddb23c705f1baf641126aae8049746a42d88649ac
font_02_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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