Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9375637467bae4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 02:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ed81d02a06bc28bf3fd13990eebb835 SHA-1: cbba490826622945e9447616bfa752fdd47f9d68 SHA-256: 8c9375637467bae4354af1e023db6d4b3f13934e107077583f22baa0910f49f2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's purpose is to trick the user into installing a browser extension or update, a common social-engineering tactic. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=best+pdf+reader+for+windows PDF link annotation
    • http://clinicaveterinariacene.com/userfiles/files/kikamoloku.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e965f7c437---35617539783.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/48438212072.pdfIn PDF document text
    • http://santabruna.cl/upload/file/fexokalasodugasurewawimob.pdfIn PDF document text
    • http://119pump.net/d/files/keforisepezilituvaresu.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/96446578829.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/48900472349.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/zudiwunavinonujoloj.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/69742231983.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/70217053742.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jedunizonozekamuwadavoreg.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fubobus.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///wumupudesexogowulu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/38727928710.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dabac036---wekikofa.pdfIn PDF document text
    • https://parkettworld.com/upload/files/vafebupeluvolizuduv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a14cea327---28250238686.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/880f9b3e2669a7a62c8bd942b022fc60/mugomip.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/16374436856142776b7362d.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/damaxemuvojinijuti.pdfIn PDF document text
    • http://dongphat.net/upload/files/22371202891.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/6685106304.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54442506123.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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 17812 bytes
SHA-256: c620381de7dd722f9dbc44b6a644e21253b914a77ed717b4541b8457340efc83
font_02_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 10584 bytes
SHA-256: d469e59aeca3e4ee9ac4e3dbd081af86323bb1f3640cd044f8408e027b7f6498

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