Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8a5885015636b2…

MALICIOUS

PDF

83.8 KB Created: 2021-07-06 19:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ac68acae6510a2ac1de2b0a38250832 SHA-1: c313a10c8d4a7f3856d2c71a3fab9b3b309e4c0a SHA-256: 9e8a5885015636b2f6390341eda13899854a0b820d2365cbd56a4d1839c5defe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079d162bd---13155550683.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb78ea73db---waxuvusiguxazijidekaxej.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e90e3b549526c2890944ab254c143d23/ruwemo.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/81267339573.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/69287674181.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/amhellkvjqfc559523trmoa5f3/natifeguranalimubogo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3dca97d2---45684681781.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/jeviruvulolalufuzizijidut.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/50136063879.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/327b51ac68318a6a8732709a6ff0e540/nuxedemasitu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b3120185---fumuxusumibejaxikigiso.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160947aa9c21b1---67105715017.pdfIn PDF document text
    • http://learningkey.org/userfiles/muputejeranogiduberipel.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/298eae1d8b6b1fc9c77806f3baba4c15/fadenexozajob.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830392ed6d2---molovirotitawerinunupo.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/69479820745.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/63430855407.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/potabotirapadew.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdec8e59e0---69115224111.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/29293235220.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7dcabf0be84e673f7bbb8269647c25f7/zegan.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/148741984560b0be43166bc.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33b162c1e2---dejaludutirojorib.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/titewototivemedaliguniz.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d3e461e4---94566765521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=right+of+way+in+highway+engineeringPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 16716 bytes
SHA-256: 97b6a10e62417eff6fd7f17adaf4f0635b80a8817d4e7bdec6a7f354a1f47da2
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 10524 bytes
SHA-256: 4997d4ebf97a6b9c0c17726e25a73ef4e4b7c2a7b705215aab784b422ebc3187

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