Malicious PDF — malware analysis report

Static analysis result for SHA-256 406c78e742e1f457…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65b90063cf1dd99abdbc0e2a345d2808 SHA-1: a6d5aa4f200f4ca3ad03942f56d41a259150a604 SHA-256: 406c78e742e1f457ea9feb9d5aca360e70e06ba8cdf945ff6a99b33a28a2d7f5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c766a82af---mikaxobexejaruvumokujoze.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a787373480---zixitelizebodujapivinaf.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/s880ehrfqinu18jkkvv3227v0a/wunenuxeket.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210725_0917D53D79CBB674.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/bowalodidelifif.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4e774d89f47a16fc6e0a3afe364762ce/9872297113.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/79714303874.pdfIn PDF document text
    • http://gapp.fr/medias/files/juvulokirid.pdfIn PDF document text
    • http://nineslash.com/user_file/file/wuxobavexir.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/65685143435.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/fimigojodibijupovem.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f25414b8c4b86f73180bb127168afddb/fivoviruginaketap.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/ripuzizigawetudona.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/lodisigigukegujegoze.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gsqvd9bllpikkmsah8clpgt3d2/midewugikokazado.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210613145014076.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/64240603863.pdfIn PDF document text
    • http://afslab.asia/upload/files/jatefuvanumo.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/lokoz.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/raforu.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/pukamugubok.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/gt7eupk1fr1geve1j39en5m1c3/nugezubutexanumugujikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mp+samvida+shikshak+child+development+and+pedagogy+syllabus+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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 11472 bytes
SHA-256: dc714482dec344e939bad4006a945f24893df6712dbb90aa9dea3de433659484
font_01_sfnt_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 16244 bytes
SHA-256: 237c5472cc314943d9057e8504ea6d2a3b4cbe0b56e968a5d0fd0876a86e1dec
font_02_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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