Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f46880389eb0b3…

MALICIOUS

PDF

274.3 KB Created: 2021-07-04 11:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11d9e8b2faac31dd83f860b6a7432f68 SHA-1: 8754aea385f22d4f82a989fbffad13349fb543af SHA-256: d1f46880389eb0b3819d5d5c1a4caf25a7342866151032eefecafe7892f7a97d
174 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. It contains links to compromised WordPress upload storage and employs a deceptive download button lure. The primary attack pattern involves redirecting users to potentially malicious content hosted on compromised sites, likely to trick them into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/213dd50d815f9a71215a8606a26b79ec/vozamawuvugikulonodoba.pdf In PDF document text
    • http://moneymaker-gold.de/files/89604413740.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dba8e0dd3c1---tuvewaseregiruxomudojik.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kirorajudodekilet.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce478330b---gagiponodudima.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4666824b8d---mopojeletogulu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64a83b5a91---91951208833.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5acf53342aa3608bd8899e7f155d7213/32612603809.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e958bd10634883070da438940b43140d/59618915758.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/6032109798.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d395894b4---95632041407.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/25978412046.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/92e6586a9cc0e57665946ce44e0a112c/jubejowu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/67760489716.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a654ba9fb3b---roguragefaz.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/gagexojoxukuribopeginimu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48da8aaf4---93732367431.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210615000752.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608211b30baeb---zelulafitadofivuparuxuw.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4b324mvefva8hoek43j0o73efq/11434843512.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/4827025007.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/24625255033.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rawonuwutu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/20943925846.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/90212482690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=english+form+1+textbook+answerPDF 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_off0003d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D77A 11116 bytes
SHA-256: 1af02ee803fb3f7598a00709c4a66548c1dbaceb42bb0aae7aa5883401dcc731
font_01_sfnt_off0003f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F14E 18692 bytes
SHA-256: 928bfd33593fadac9c089e07ed3da0cd091b61db96fc205aa5f04a6677abd8b5
font_02_sfnt_off000422a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x422A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1