Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f36aa336b591a3…

MALICIOUS

PDF

91.6 KB Created: 2021-09-04 21:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f36feab8fca02276362392d2490d0399 SHA-1: 6e43cba1dc7b6ad35945ce9633421a75d7c3d2e5 SHA-256: c2f36aa336b591a38aea2dff50b64e8a9a29efa31d780dc052f698aff804764c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2ebd1da04f066306424033bbcf333b5b/47264967108.pdf In PDF document text
    • https://rjpexport.com/files/33955089547.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/18550048555.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/numokaxi.pdfIn PDF document text
    • http://sakra.sk/storage/file/46794524542.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/9171437319.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16079f52b51c0d---96884984202.pdfIn PDF document text
    • https://ebooksweb.net/files/file/36571846949.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/gopopinitis.pdfIn PDF document text
    • http://absigorta.come/file/24675159152.pdfIn PDF document text
    • https://kham.vn/userfiles/file/37675857855.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bezoketonopedovoratino.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a73c23aad70962dcfd5bc7e6161a3f80/32486516899.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d1c1b24179846d8246ec434ccd9a293e/nexobew.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/17565547667.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883d56a49---54616055818.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pofalululirepefinivalolot.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160949521b25ec---wazeliduvusepozujeku.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/bigeno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081effa51b32---70807031281.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebf5f176d---gasuvulajilulepomuvi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/33070017203.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611640d1d8dbd---14662658049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=parole+crociate+crittografate+pdfPDF 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_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 10524 bytes
SHA-256: 5042424fb17abf85d8e3398e274484f7abf0778ce2fb3552897790f63412ab82
font_01_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 20276 bytes
SHA-256: 355753b8d7f64ca019c938800694dbe3b4e164ba00225babd1c1645c920c9a0f

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