Malicious PDF — malware analysis report

Static analysis result for SHA-256 00306a36c4459b67…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 21:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d49941fde1d82b138cb0e59cffcf93ce SHA-1: d916047bf044732ea8767d77a446f9406768eb16 SHA-256: 00306a36c4459b6722e8588afddbaee583459c7447258e589a0661abc0fc90d9
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ae7a01854vthgb1tb3hmjs0kbn/rerute.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/12712763259.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/38448431278.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/39114956198.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a12f6350b7cfa3341c70e60ac6014b32/15145494753.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/koxojawixuk.pdfIn PDF document text
    • http://orlickachata.cz/files/files/30487703694.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ecddefc547acdc630cf5b4f393146338/dezedorez.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rovobun.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/33324392535.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075813deedc1---fusuvamijam.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/budanasewojukitovajejeze.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/2550205118.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bb7973796---60520334193.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/fageragabugaveje.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a0b51c6a996876bf9982ac3e759930dc/vamugowuxorozekose.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/64843381403.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/39367104803.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/22938030342.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/32445055810.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7e352a9ba3841664cbe7b67bff5bb827/pupemogarojenijigelipuda.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8e3f149d76e8961d1fbc8f2d73175628/47183353847.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791c8d99a80---75455757085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=design+pattern+java+workbook+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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 20760 bytes
SHA-256: 33d70c82de7236689421f396b2e7d4f381624c62267c36eb60306af37499d9d3
font_01_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 11144 bytes
SHA-256: 44553d94e6f10ab1eb428783a608130556ef3c331c2f9f0f0cf8af1e2a226dbd