Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62e675a5c2f3702…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 06:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98f086c8f2af0eb59a142b1ebc65eb93 SHA-1: 851746eb58f0ebc78af745eb7e8c834a926c22fb SHA-256: f62e675a5c2f370243e55303dee4a518905adaea0c832f3c452e738f8fb49e32
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking a link, likely to a compromised WordPress upload or disposable hosting site. The embedded URLs suggest a link farm strategy, common in phishing campaigns aiming to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/imgf1p7qupfrohgd5mp2prqfm1/joronifumorakojokogew.pdf In PDF document text
    • http://finpacecuador.com/userfiles/file/10984842313.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///nelurozajoki.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/79857217186.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e632965f6---61701147975.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/552165e1cdaa6f9f7d7d8c18eafd8e97/2580653836.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/90038389516.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a8d635e30---18965041480.pdfIn PDF document text
    • http://dzbnf.com/upload/file///72143821423.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34d6b7451---45543345344.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/23162904723.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e323c197fd1---44551608071.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527020724.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/619b0fe8d07c44729d000f7b4ce73fba/53110186897.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086290bb607f---74283816596.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/dakevutoz.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/42113238028.pdfIn PDF document text
    • http://ledins.lv/cms/file/45566940575.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/36039659268.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e9cc850b---turubofot.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kj44m2pd541l55rudphja1j8ir/12296835397.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/86978702742.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/fazekosikumezepusaki.pdfIn PDF document text
    • http://elitvorota.ru/f/file/mogepomujanivuvuruvi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508f98d40e---fexemeze.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/mimosowosovefenatuxaxa.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/79170712396.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7bd14974a7d19f8f1b780dba7a33b93f/sidinoxite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=labor+law+2019+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_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 14132 bytes
SHA-256: a58a3eb4bdcf4374e78f593dc5745b1ad34f355bfbb873bde39b4a26bd941ece
font_01_sfnt_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 10544 bytes
SHA-256: 50e5faf3c0427b978f97df7e125ac3246d00d84768b69056afede7ac58a54ed3
font_02_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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