Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca4a23c4cd4b603…

MALICIOUS

PDF

87.7 KB Created: 2021-08-16 22:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 470fb059d7d91ac85a356e4c1f0ab250 SHA-1: 7ad67531ce417e2f3c45e9837c4d36790632d2fa SHA-256: 7ca4a23c4cd4b6037118b8bedf349432a4fbd8791be8fdcb90fbc0cf4ccca8bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate attempt to use SEO tactics for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lecachet.fr/docs/files/36038599143.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e06f4a417b0728235ffa2f75c8b936a4/fijoxazezoporopan.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/52206688112.pdfIn PDF document text
    • http://planbmedia.hu/files/nodonotimofekofeguxalobu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b7c54c32cf623ae73ad1674c0af36931/tepazovizatikikifunideto.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6bd28ccf---xesobazawevuxowejo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/75164014664.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/vuk2526rfcsb3mu9d4u19g4s7p/giwesorepapojuwod.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/zurogotejen.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/32873440077.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072810375976975.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b7e86d6e---ketatasawodala.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/savolodufeboxevik.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/74617122868.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4saj5pdb24q857ckleghr484kg/mixowugezufav.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/1662538009.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/13331deb6df700acb479d83a9db90fd5/suzexurutixoxulet.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/54932427381.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210611012932.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57c25a0ba---29851002208.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/36997096266.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/69957390706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+wall+e+full+movie+online+freePDF 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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 10680 bytes
SHA-256: cb3168abda87bf05492173fb4df51c2625da261163a4272b83b59a9aff10f0fe
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 17396 bytes
SHA-256: 6be915d5d19d9c217566747d16ca701cd80689b443fad186a8507eaeb9ba9066

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