Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7089050852996f…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 18:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 254a256d597cb343e71e7022c7b805d3 SHA-1: c0265dfeb7e4e35880ab5bb5d5a078806c17646a SHA-256: 3c7089050852996f2bcad6aa93f47c33b10680dee1aedcc5f6dbd4cbe37611c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=how+to+study+for+a+permit+test+in+california PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4b75a297---87575006929.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da803d50b95---parufaxegaposezev.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/43970869373.pdfIn PDF document text
    • http://szpk.hu/_user/file/83804056753.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/95313426196.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/36990646204.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a4783da8162444c626c5014c2692eeb1/fopebonemodulik.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1c62714eb88d3f216ed452b57146f962/43565650884.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3105177051---44110004212.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/mixanitatar.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/darafoteweki.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b8i0d115g39mijud0ukmmrrl01/nijed.pdfIn PDF document text
    • https://digireg.sk/upload/31016137085.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c65ccbde8---42764058413.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/99619198489.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/befipameturukesuwusugit.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/zovogefizixo.pdfIn PDF document text
    • http://kovtec.pl/eurostyl/photos/file/14181606750.pdfIn PDF document text
    • https://avvocatoboretti.it/file/6374577631.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e177915d3---xakaduregedim.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/5d66b2599db81fc1eaa3e3ff0c951e87/51370234383.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/71446547168.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/31051309117.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087988b558b---mebozazo.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jafasutenusifuju.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zexazu.pdfIn PDF document text
    • 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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 11072 bytes
SHA-256: fb37a4fd235151b75ab5cfdab88ffc3d566a496d4c64e95c76bd4a54409d78c7
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 16808 bytes
SHA-256: 22e0f51ce12159cad6095e9b74b35ce4158e4165c426065367f1748c42efae9b
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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