Malicious PDF — malware analysis report

Static analysis result for SHA-256 98efb879159a30c3…

MALICIOUS

PDF

95.4 KB Created: 2021-09-13 20:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e74db76f722f240a51ee97a8c4160d0f SHA-1: 01a954246b3823e1808f658acf2f51519b65c2b7 SHA-256: 98efb879159a30c35cc19e38c23bd4ccdf9a2106b771ff1eb6055d0b4a7a589a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86493cae4---medotidadusu.pdf In PDF document text
    • http://narcisse.sk/editor_uploads/files/53389949963.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2713da6f37af38e236008aa932676af8/fozowagubuvigibarube.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/roxuzejamufubuj.pdfIn PDF document text
    • http://nessium.net/userfiles/file/wubixakativ.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/1a7qop0bh0ehhaltfc1kub4vcf/danaxoxev.pdfIn PDF document text
    • https://scalping.ir/data/files/file/63168022202.pdfIn PDF document text
    • https://maymac.info/userfiles/file/20198207103.pdfIn PDF document text
    • http://toroisg.com/public/images/files/90587319639.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/ludesizogemeg.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/51771323839.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b082bfc7---gipipikuzodowidaguko.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/pajojexonuxufetivoxeji.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132533fa2509---lirinizeg.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fupopuronebozegeson.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/nefukutanivatifera.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/35382334404.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/40277776250.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/7761910912.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2021127431683726ac111496abb706ac/49180903412.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/16226677864.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/18548071474.pdfIn PDF document text
    • https://petek.biz/resimler/files/temuxiwuwabaruka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=game+of+thrones+the+costumes+book+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_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 11116 bytes
SHA-256: 7a1a27db8c75527f36c546116bf7ab9cbd0286de24073669cd1e28243e01273c
font_02_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 18932 bytes
SHA-256: 150edc72a4f608786d874d8d815cfab3b91ae4ff76bb55371c6209918f9bd88f

Open this report in the interactive analyzer, or submit your own file for analysis.