Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d137ae544fc4c57…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 18:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 626746598a7a98687c207a7fe1529931 SHA-1: aca0f8cc8fab5482cd7ddc464a31ca03d6b4b1e8 SHA-256: 4d137ae544fc4c5713fbe9c9b84fed2ec20d90e0661be6a899d6e75b107054f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised WordPress sites or disposable domains, increasing the likelihood of phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855484a9ddf---16094791498.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4f0aa71795ac4d4cfebef40b12338696/45616970420.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/7801255081.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239fdd1ca5---bamigosezejerevu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/51007815283.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nr2sifas788om5nu5mmj6e3qe3/vetexat.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/355780f14f9de6b70668927f39258ed6/38792804939.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/35864090789.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/wejeludewe.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608828ad37f39---94816074641.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/sivudunutanilizarenu.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/15785085141.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/54177593085.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/22d90a028ac7dac976450f75d84e5232/welutotukenasoxugo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a12389f1d0d---85159972067.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6vvm30ne313q8g7jgqf542sfj4/kifenu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e95ed5b0---piweluxukapejavubarazik.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16120095bad8cd---jixosimurafozivim.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/56618626962.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e83k5svocuqqfupljd7na544g3/gojolojolefugirogipovap.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/xesakobolagebekumabete.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cca3e0e13b---57644923689.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fab8254fbda---82545237485.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/83497917249.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/34486383710.pdfIn PDF document text
    • http://findusafranchise.com/files/files/40775599942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sample+marketing+case+study+questions+and+answersPDF 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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 11472 bytes
SHA-256: 07858496e74731e2a6fd877d815c2f276814e278aa5f67480ab6670c0e222b83
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16940 bytes
SHA-256: 72746ab31eec28ded4766050b9a1e2a6f7ec23ad7614c4faa016bc8bdd03b16b
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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