Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a81678057299d3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 21:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d464f1364b9f2df54a88c78900c0d28 SHA-1: a25b62ed8b9fa05adbee328a005daa6aa1d5104f SHA-256: 09a81678057299d3553e1ed668afcc8b19c66c4d02b14ad45ff1c8b1735d4f86
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF itself appears to be a link farm, leveraging compromised CMS uploads to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c468702b86d---gaxitoxokagikamux.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/98437ca58bace36afdbf1f33d4e70322/setolurigamaziginijunafak.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090644d22d8e---zibabiw.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/lanetavafudupanamakorom.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3sdja1dd493lngssq4of474qjt/wamirijafepuvukalopagano.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/jesepuwejijevejalago.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/92996191348.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/64937873905.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab517da39b7---83057665889.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/57284831778.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9a0d15d8---fivadosopekuwa.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b635416627c6f42277e42445e3b392e7/44716022690.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ecaacca3---natezopafogafigafewe.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/69595223072.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/vokinodonitalafevemis.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/79331334468.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/28456315754.pdfIn PDF document text
    • http://93564497.com/userfiles/pibiluberupuwi.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/68420576506.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9c2cad02c7dd2aa1ee5b823637e6b714/79260784185.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/80875879977.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kanakupujuli.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085747189b6b---80341268595.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3665e2f7df---lofajojomibovefuzifazax.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/70838777843.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720a5acb4f4---40858819836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tbilisi+bus+map+pdfPDF 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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 18444 bytes
SHA-256: 2e61ca61f708854c6b5a6b71838b8b41e555c722250f625f54d7cb8351b3003c
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 10308 bytes
SHA-256: c01b4ad65bea030023841b447c8b39bc6409252eb6dfad4ac79a18c56c63bc24
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1