Malicious PDF — malware analysis report

Static analysis result for SHA-256 023c4257cb292e52…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 23:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e3cc244375f764b466c27f5f6b432f16 SHA-1: 9ee8b32ca12919c676130bd8825d517193839da6 SHA-256: 023c4257cb292e52c0b0a2de1cffbe276f7c40927eeacbba0f0a5ec7654b1505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest this file is used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=subordinating+conjunctions+introduce PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7640b64041e5e18ef3112487f745fd0e/84241752776.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad9b37fac---44339097304.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8a05465f0b6e1e366bfece0d0f114a30/76003715160.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e334737eb---11905954271.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/janijawolisoxex.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/51904398586.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/44706691200.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/32623069867.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/depug.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/nevesimesexofozovu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51a3dc7e4---36859085882.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c5782fed032d7ee9dd82eaa9894c72b0/46377081433.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/gabanelafemerab.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/bikuguwupojifuve.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a483f919---fomavizorunaligoxekafe.pdfIn PDF document text
    • https://kermanrooz.com/img/files/92450324898.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/12683961626.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/8134985390.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/u88rk16hluin9eleav6tgtia3t/38351695467.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160725c190e6b8---86801060737.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/db598581533fea924bbd7c94467944c3/75974000502.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/20138802816.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd964afd2---segolajidilixoxefon.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/24156338609.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/tudig.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dc822701bfb11c9b8021fe30a9d3477c/29265518427.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_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16908 bytes
SHA-256: 37e39200bcd1254a0b549fe0ad17a4df75b64941dfb9d74c0056fab640849f8d
font_01_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 10944 bytes
SHA-256: 5df0afee5ec3d3a7cc94af6041d087c797226a9de3b41e3425dbc9b181443766

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