Malicious PDF — malware analysis report

Static analysis result for SHA-256 40224238585a728c…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 03:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3fcd4507c583ec720878032aab0e13c SHA-1: 459bdcb0a423cd332df540245429b01105c1028e SHA-256: 40224238585a728c8b5266efee2d93d093ea9b4f920cd5806faeb751173cd437
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4aa3c9b9e1b5549031d055b072b3b3d/betebuzabekupovupudowijex.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/39ghqo9j1v5aot1tia91kl2sl2/rejexifibofemibarozajul.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca236ab3d---54282621847.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a33a8f6a41c021d6756a387a79ba9c16/zediribu.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/73650425232.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/82c1ac648376afa38a309b9d02688893/36187379632.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26e6b8596---59850881929.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c2539a960---toditonisobobamaponoduje.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c59816c5169c9479253added93e02b1b/dafexo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/cc9a15301cb2a4f744e442747f89aaa2/51464679297.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kitemakaje.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/k9cp5nplklc85ht4ke2rs6nts4/70747444891.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/80063395529.pdfIn PDF document text
    • http://jainfarms.com/uploads/67173945477.pdfIn PDF document text
    • http://ned.ru/uploads/files/47209645177.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/04074f781d1ecad8ca51619af614697e/jopetapunezixisoda.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/50755283520.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a2bcac45---55315049766.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/30834590050.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab051163e48---61665909660.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sehjr64fkogfhijg1bdhka2lec/waxujiwusokeguzenadujag.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/82347780160.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cu5ob2q2djt839mhl0ese57eoc/jemopanijerijek.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/lurotabotixuriwagagew.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8cpu7fs2ql3vcff61i389elg31/zifavomowalimuzafepesin.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/74946488358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2020+hyundai+sonata+interior+dimensionsPDF 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_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10824 bytes
SHA-256: abb6621270abcd5b98f962eaadb1b103942c0de0e7c9167752c7e57a31e5153f
font_01_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 17844 bytes
SHA-256: b9d4eaba81c71bd3969fb151c5f0a14fa35a4b4adcbae6d8e24560a0255ce9a0
font_02_sfnt_off00014c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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