Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb4924b018def8f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-05 18:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e59759287cf54d3a6a2f950dfd66bb39 SHA-1: 6bd0f8ba44746affb189612b46a721a3c8068500 SHA-256: 9bb4924b018def8f82df986c49b0f419b401c9893eb4f9dbcfc1b9daf364189c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious PDFs. The embedded JavaScript likely facilitates the download or redirection to these malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2e34lhhrq1l2bhrdva7e83c4h0/taxujejapeduzufatopitiv.pdf In PDF document text
    • http://manpukuorder.com/uploads/files/vesunaruzogojazexopulo.pdfIn PDF document text
    • http://casaalu.com/luutru/files/ratewizunas.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/80059377247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac526dc55ec---36508715456.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90879b651a---27424028450.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7f30d586ed4f5e5d165c49d397bd9235/1122979340.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/bulij.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/vebotekuxo.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/23702252804.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/najupagiza.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/98028831167.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/51777533109.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/mupajusesapuwaguludosalow.pdfIn PDF document text
    • http://floramarble.com/uploads/manesigiboferujiji.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3ej99odhambs704a9imubbd5g2/tovotanorogewemozib.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/92675294274.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab594461fd1---gataxitenatotewugizodusi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5f12159564aeb6be5bdf005eff36dc29/60436273084.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33775b94b8---20942921126.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cba312bb---14341686040.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e92b99c0dd46038f6088a53f10d723b/24965287650.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/155i4ic1k6401ob2o3aa8m68h6/xezulabufelidoboruba.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60d92e158---81002858140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=liderazgo+espiritual+oswald+sanders+pdf+gratisPDF 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_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 18908 bytes
SHA-256: 25a1249c087cfab343510074e93d3290144c643f29f7fd380c8c653fea28b28f
font_02_sfnt_off00014bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBD 10876 bytes
SHA-256: 07b77431054b78f363521150d840e0cd6a0b724cba3f3bf4845bdc1bd2824f10

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