Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a06470ee66aea7…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 07:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de8db7e360deb29d1276dfbb5465f20b SHA-1: 4860ecd69f3c2efb3e37b66e33f149fd321d9fe9 SHA-256: c8a06470ee66aea7ddc953e9bfbe2c9fdfe26c32cdd08419767cd7647e3c9ad4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress installations and other disposable hosting, forming a link farm. These links likely serve as lures for phishing or to distribute further malware, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=how+to+know+chainsaw+chain+size PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jivl4h8bq6hjppn9egflgen8q5/dadezovilarewe.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/75a79a9c6ca964b663e8256388e5c5b0/19756885903.pdfIn PDF document text
    • http://llux.vn/uploads/files/sezuga.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4514e2ef0d---ronanaduwewunuvasavu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a3ebabca---gobigu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b9e045ad---21259131639.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607675667888d---73597221403.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/04a5bedf3042eab5bc8cb63dac8ccf1e/xadakosasedajiwunif.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074312d80157---rojepetatun.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf3fe31472---morafajivodunoz.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/dilovunuwobazoribadapu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/lesuwavuzapa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/696e5hrqfejpkc3vmqbb5q3fic/9570612254.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210513065419_642096115.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/jowixesunulen.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cad4e80c4b1---sizuxalono.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627050149299.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/pasadavababofemesuzi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/40cbaa5197f77e534fb46a15f3afd352/7457478383.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/10853077025.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/neror.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/nuwuterelabi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e885273aad---jimonosimabatupanolaxerel.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dizureliluzejexa.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_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 16884 bytes
SHA-256: 610d0dc8cc7814011f532587fa8fda0abf62ff2c1b099d9abbd97a82ae2e851d
font_01_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 10408 bytes
SHA-256: 55a6c9ace2fbcc599a32c2ae3a744172a35a4353f9f3a78271e9601d5132d5b5
font_02_sfnt_off000137d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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