Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e84b7e1a905b61…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 06:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 173114e3f6f77f3c0e72facd8b63b4e3 SHA-1: 16ad0faed61a7cebdbd07426a32a27bb863d9fb9 SHA-256: 43e84b7e1a905b6128ed16243b5c096b81e6b005662a86383613a050b3debd29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=powerdirector+not+watermark+apk PDF link annotation
    • https://seerupit.dk/assens/file/94339012319.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80086384439.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/79519143342.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161468a3bf107a---23857814990.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/vazuxufiw.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/fosaw.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/pafakuriduwijag.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/bozuligijedaxuteka.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/ludowutozuwebix.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/fozuwufupuvuri.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/nimamumuvufubogezu.pdfIn PDF document text
    • http://dentistturkey.com/image/files/86479813996.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dixepanirim.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/vifijop.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/20698032756.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614018d6d86bb---kivukokiwozulevodebewif.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/50846420840.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/59852393812.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/9767694522.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0613ab65---godenokanuz.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/xovuwukofudi.pdfIn PDF document text
    • http://analhospital.net/file/files/jupob.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977e0a2192---96384819717.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/feguf.pdfIn PDF document text
    • http://toroisg.com/public/images/files/zuzulefukemujiku.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/sibekesor.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10640 bytes
SHA-256: 2067a7d8ecb83270feeffca1caec7b4606f66172bcab4c3fed0d5ee61aa276fe
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 18596 bytes
SHA-256: 5e2f5308074d459bd98767a2c97119ceb4124e8efef521e7fd499928d567ce9e

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