Malicious PDF — malware analysis report

Static analysis result for SHA-256 65813c09a3bf2efd…

MALICIOUS

PDF

89.1 KB Created: 2021-07-09 18:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4aa2c2088a26c78d55d32e5429a194f0 SHA-1: 6ea9344f4bb8fa532a68398f3afbce5e95569a6c SHA-256: 65813c09a3bf2efd3f2ec3e70a81f984eb5fb2ef84bfcda40bc587cb70c53314
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate a high likelihood of malicious intent, possibly involving embedded JavaScript for redirection or exploitation.

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://drafthe.ru/uplcv?utm_term=my+neck+cracks+every+time+i+turn+it PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p6ogrf8q7a7fuc6to047h66eg9/riberunoxegixogoxemuxiwu.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/gizojakenanijasibajipek.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/50969922700.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/eb16a9502c6f98564ae2c3674b37a37a/62936737630.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1eb20667---jejogamatajilidenexexawa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/330922247fa541adace32ff7aaf5fc67/7907797749.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5663efbbd---gaxamafenovozomaxufeja.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160708fc6df1b8---6335560109.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/j4gjavbkieknla7t28f30gsbgs/sanebejuranujuso.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/nijivut.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a1da7a9---10980431144.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/resanefakesele.pdfIn PDF document text
    • https://aedwea.com/upload/foto/gigetitaroregosidogojevex.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/35833044527.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56e5cd758---63071045230.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/mapolelebuzepawufevizosek.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gilelagulogapasiki.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/26836591582.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/temanopigefurawinado.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2phf6glou8h6ft5o1v8q8pdqs1/notixusavowasanalusil.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d2c389f77142ce8327d448373342bb68/jojoxakonamutaruxapuvejus.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/zagineveduz.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/83609862523.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/puvesaga.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1h0jlom7tdav71vtlgvmvn0973/wudobuzun.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/07df840106bfe6c3b2c8d007459ebd18/sedojedidusabukaxuzirese.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_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 10592 bytes
SHA-256: 4cfe1e4c9918742039b5281db3292b0553227546ceff657fb4e21f476bf1758d
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D70 16060 bytes
SHA-256: 7defd2861dd64e61e3822bea98f6d91e1d2965b327c7e9ea5a36911135e34fd8

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