Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ecb022185a8a51…

MALICIOUS

PDF

96.5 KB Created: 2021-09-08 08:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e85d452c1b200b0e649f3ed15456a8e SHA-1: f836f1ba0c0d5365d045bcf8f6694a39eb8f1558 SHA-256: c9ecb022185a8a513262aef2c024e7d1f234dff13fc6ea45ef151b63a0b60908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn--pssa17sw71b.tw/upimages/files/86556492727.pdf In PDF document text
    • https://menu2uplus.com/images/file/rulivozupu.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109051655098127.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210803124115.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t308j8jcq47kba4ckjp0g86rjq/21236594337.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/55508144349.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/rutukenanigin.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/592640796.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/lujivoma.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/tumigebukutotigutawiro.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/49598723928.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/62f63c830b0afad769d4b0f9a0e4bc84/sunokurozazixe.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/56176827642.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/72832707234.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210728174601.pdfIn PDF document text
    • http://dgjst.com/upfile/file/96680525760.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab95aed311---14594534798.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/310733329543.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/matelitefavegorotiwelu.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/89505875147.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a453e6217---26958148207.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/gipawatafog.pdfIn PDF document text
    • https://manenshop.com/upload/files/64472994712.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/19336iblk85up4c8l2mqgmdi0p/doweginedawexoxusalesufeg.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610528c5a004d---62573423648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=manual+agricola+juego+de+mesaPDF 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_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 22132 bytes
SHA-256: fbb685fdfef2d762b5fe8d7d48db36954631a91314c0a3139c729449bb98d98f
font_01_sfnt_off000141ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C5 10836 bytes
SHA-256: 1c31dd4aa0c6a82488884a6114b56336445bbfd7a722e6a3cf784aeee3f15bbe

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