Malicious PDF — malware analysis report

Static analysis result for SHA-256 7877d888b2391227…

MALICIOUS

PDF

68.3 KB Created: 2021-10-07 23:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a747713dcc569d58ca72a544433520fc SHA-1: 2fb9b3b68579c9da02af6bbc78d4481b2d828c9d SHA-256: 7877d888b2391227e77805f8d55ae2620fd3693ebf0dfbe0f1ba3d31862dc806
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, but heuristics indicate it's an image-based lure designed to trick users into clicking a link, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 68 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dragonera.cn/admin/userfiles/file/bixukifoguverakigivanu.pdf In PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/66144291096.pdfIn PDF document text
    • https://pecsikult.hu/files/file/27334291854.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/75283991390.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/26536997898.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/80540183295.pdfIn PDF document text
    • http://parlagame.net/calisma2/files/uploads/gimosoxudije.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/80787137896.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/57850609162.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/kadala.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ee0ac6c9299d02cbc02d67450a9b0f54/94578864618.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/79214960607.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/92030342085.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906011937_76226855.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba5e7e82db---vabajanudovadew.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/3561403836.pdfIn PDF document text
    • http://e-uchebnici.com/img/file/mupegoladi.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/daxenumisewomafa.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/deviponoruvika.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/77103891433.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/45325817475.pdfIn PDF document text
    • http://opsir.eu/files/file/86436915936.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/37228062417.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/vizufujutabetexuju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614538d339e01---benizorazagekikatukiwubug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=foods+good+for+high+triglyceridesPDF 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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 14044 bytes
SHA-256: 91382ac485b9a69f61f5342c3eb037abffa0b13aba534cbba6604b617341cfd5
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10580 bytes
SHA-256: 2686ab9867e74ef54ad174c1c7bdfb156d12cb2ada6d0526347e2b04beedc3c2

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