Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf9f36ab9945bae…

MALICIOUS

PDF

89.4 KB Created: 2021-07-02 17:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bac1dde3c449c44e12a2d48b62b4f021 SHA-1: 02c9a78aef3deeee0634ab8c3ec24e5b30837207 SHA-256: 1cf9f36ab9945baef329b842e17d00f6919a8a6a8121de57eb23497cfe859350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit user trust by appearing as a legitimate download or coupon.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fea16f43165081121ff98dd207afd70f/bonekaponaxoxube.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc9d37106---91388854058.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/jakegimajafatu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0114fa4262---sakinafemumerijizelufad.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c4993c043029d7f8f90c61aead05eb10/85014595046.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/fijalopujulu.pdfIn PDF document text
    • https://stopserv.ru/files/file/87004281312.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098458a54444---9540711501.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/91056657913.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8a34ed97b98cf240fdfaf27043455a04/35616379278.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/48ed209a4359f2c74b3f2c9c3b48b9de/vaxofidono.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/275e0cc024265e2aa396dc3261a4eb4c/zotixubevuja.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0e88fbb7---wifutenov.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a330edce---boloriguga.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/32853778140.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8bb793bd649412f98ec267d3b6cf0ee2/lipuwonimaxowakunux.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/ponerufonoti.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608521bc708b5---jizijawowex.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/91777891079.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/44a0b232a6aa2a6b06c8c0e72c4f0a41/xemurezodasini.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf986a0185---xepewowami.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/95460795742.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088beaea234d---zaferojidine.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6442759cae1efd00fcdca8149e02b7cf/lirowuzufunaxegadipakitum.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39bdee713---nijisuvu.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/89885280670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=impossible+whopper+coupon+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10952 bytes
SHA-256: 890749ac8d56ed728dabe4b5c570da379df7a18e2881ba9fa2689ae053d8c686
font_02_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 17720 bytes
SHA-256: d4aa6d488b5b02279fc2a0b0f57ab3f38e1d73ba30d72969640bf9670f073b15
font_03_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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