Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca92302e4ebdddc2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 12:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05783e8e99024e2a239d013d5d8fa62b SHA-1: 6e3d24420bc9e40757601bc3aa6d1d83b6bca972 SHA-256: ca92302e4ebdddc2788b81e0c139a158d80726eb6f1cdc611a7475ebaa31a6e4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://atoutslegion.com/userfiles/file/52680138172.pdf In PDF document text
    • http://rayhovietnam.vn/upload/files/dijesukib.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210913001206.pdfIn PDF document text
    • http://matras-devison.com/upload/file/30193705694.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/58166858105.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/lutitugifevediwixufe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/td4ajfu8rnceemc4h6403tn151/65670325741.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/63072952572.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/88625051244.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/jezozumiviwexis.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/xawomitimaxubedesewelipup.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32764357151.pdfIn PDF document text
    • http://ropesadventure.com/d/files/94155384555.pdfIn PDF document text
    • http://makaroma.fr/upload/file/472776944.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/donomiwonalaxew.pdfIn PDF document text
    • http://ebus.cn/up_file/file/padosefoded.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161341077a342a---19378668239.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/tojasejoliwejilo.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/zidup.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142123972b4b---bukeb.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/40508048380.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/92980219633.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/dameji.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/7466366783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+multiple+fragments+in+one+activity+examplePDF 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_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 11328 bytes
SHA-256: 8d5ebba3aee9768a33c3cb72844fe523dc5ae542783379fe532458844047f81b
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 17040 bytes
SHA-256: 2f88e110d649de835bbfc0e2c37c38a79ae41eaf2c144b77bfd07e239427da14

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