Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd01e89aa55edc…

MALICIOUS

PDF

79.9 KB Created: 2021-08-04 22:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bc850c387f55288f05238ab1f501e4d SHA-1: 9eb747e711a44e141a44bee0401b034ae6747e15 SHA-256: b8bd01e89aa55edc0d185d055e5e2310f15333b7dcfd914ad2f71113ca69b33f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination or leverage compromised infrastructure. The ML_NYX_PDF_MALICIOUS score of 0.995980 strongly supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=infix+to+postfix+converter+online+with+steps PDF link annotation
    • http://www.annaleehuber.com/content_files/file/filap.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/sijavarifozugirijuwavime.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/97228015464.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/kedom.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b458be57a5---79819025922.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/buzowuwebagenixijoka.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd0490ccd---40516102660.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/wekimowun.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f93370093c9248c333f4f4ae6ad0780e/4516747663.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9fec41136---6650754207.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uc6mdbft5ophckb3qun3moq4fm/73851456748.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/555aa152b2b2a11b35ec9f729ef5ab46/gujekafakonadufi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q6dirhfkpmm4lihi0ksfi78v6h/fazagusovogivazejoti.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3018302f---pumanenawubekirojarir.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/sekuko.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2d9a44d9---gevusowenu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/qjdmhbpacfu9ckoa3n12ho1713/30643476274.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b047329242b---51394320515.pdfIn PDF document text
    • http://livestocktool.com/d/files/19054307667.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dbi638afa039ep3i2sq1tnollk/bimububememojoxof.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/56455927195.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/96983646585.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/95992cbacd186f9f16d82ca04af2ff9f/zerene.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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16148 bytes
SHA-256: 5216af0c15c1429f251cce7fe73d1ad6064b709748d9ee0a1d488d5b844daa02
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 10620 bytes
SHA-256: 0381fa17f39c1c2907ed6fa66f2ea1728d1be3b9a6ee46d4b48ca48714ee8cd8
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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