Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c89e53be9449f4a…

MALICIOUS

PDF

82.3 KB Created: 2021-08-26 23:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d42e61a7adbee2c177dadde225baf794 SHA-1: bf4987a2e09a35dc2767d6888b1f8c328629787f SHA-256: 2c89e53be9449f4aa6be0ee561fafcfc4193866cb30b4e99f86e9de51e3d0aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://emannsltd.com/userfiles/gujivodeke.pdf In PDF document text
    • http://elosc.com/upFile/file///ITX202108141211198281.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608305166bbd7---28409916874.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/95488866791.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/66242778053.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/nilenejuwitewi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/19664615777.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210819_789B92817C674857.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0f16085f---gogiwupikazituwikuzuxen.pdfIn PDF document text
    • http://jljemc.com/upload/files/relojotokejisipinujozox.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7dae12da---zozizo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d924e88975ddd93aa70ac9936420b61/dibudafuzanepegu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ba19575d1f2c56f7c0b440abb63beec6/pulepebanozowagibiduxuf.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/33128791566.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jirivinutejamaguweninado.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/367f379d801e6ebaaa31ea18e093ec40/sibane.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/puvawuma.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/u8u0kuk3u2qlh9nbqhsb7r1ur5/baxaminoketaminaxol.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c5129c66ab4---58640411219.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7rchfqu1l6cse713t9blthgdn6/6463428026.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/688428102f1b582eb643d9799f12d0cc/jidevegebofujogegeg.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ac524196add12434559ab535b39bcc44/vabijerawiwagi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/64728317566.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/64395418568.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e82ae12f---94843097167.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/66f6053771719a749f3a33ddd3b4f4ce/48558887014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=definition+of+devoutlyPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 17744 bytes
SHA-256: bbaeb982a079ab9f6d6f31dc42de85abab815d6b0e0f4335c47644cdd5577e21
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 10200 bytes
SHA-256: 457f56b6d2bf929190ab7de8f56a6fdb8f9314df84fe04338c12310efe34a294

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