Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00da83726ea5fbe…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 22:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5475163b79c46fb0eba41271cc871a05 SHA-1: d31bdb4689f7cc2dde0bf8472ae5ea4383bf7d79 SHA-256: f00da83726ea5fbe99734f74106c6010c171feb346c89f88198c3b3bd902404b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended for phishing or to serve as a distribution point for further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://coretry.ru/uplcv?utm_term=laporan+pembuatan+herbarium+pdf PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/de55ee0b86238549b464483ac59a7e0b/jiwivokisefima.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dnj2s3vlnbm0ufci7a27265hiq/79405055454.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072808554473499.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pulokabikutewadojuw.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/49430657548.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d76494f12e0853a4132c2e3c7a25f3d7/54976252297.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1d4eb362ac4d98a0c668125c478fc568/xekesedozerofi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd860dc6674---77589566804.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/duniviko.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4dfdd34c7---78382849314.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4b0b0c429f5c2c2da2e6b39150227127/77177756164.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/90610304080.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/jalokalunij.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e8243828---89711173259.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/183d128101c9209199b4c5087db42a29/92571250291.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8709f6472f---jobekedemabixetoja.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/30t90i17lo0ogueukvcftnja74/natif.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/97606247117.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/56a7d5e85f5024d27fdaf52eb64d6fe4/52996419272.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/nuliveveritazuzudumuno.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/kaxolipupibizogim.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sofibasivezax.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608141b9e6610---galivop.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/70908265200.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/1cc26a24ba69ca2a5809f0410ae1215a/dilujisaxedumigubapokov.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_off0000ca60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 16996 bytes
SHA-256: 9a65eae88e841a9dee8661cd28944c5ad6914e6aeea32aacacdb34772ba04933
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 10744 bytes
SHA-256: 7ed81041e654743f8babbd967cccf9aa0c8b192f091b30bed72eb3dfbd203492
font_02_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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