Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff918b4b320c4a17…

MALICIOUS

PDF

88.7 KB Created: 2021-09-09 07:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd9fd4c61bbdb0e39c0455ead8a44242 SHA-1: c18db87e2a95e33e299252145ad802405ca2cc08 SHA-256: ff918b4b320c4a17bf2cd1be28faf7faac68e8bd00d5ccd617afc8335f505df5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://allytemp.ru/uplcv?utm_term=how+to+log+into+your+icloud+email+on+android PDF link annotation
    • http://narzedziascierne.eu/Upload/file/18658626953.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210901_B308BD161AB3C5F4.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/18373656039.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/latep.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136511c31ee0---dawavokulalu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/72622019396.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/vigeguvifigamaberadetebu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/570313505.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/48745040744.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/26289754847.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/34370892722.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/30824709386.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/mokarijafusexumawo.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/mezotef.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/53629512584.pdfIn PDF document text
    • http://cutskytools.com/d/files/vativirafinet.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/5820000830.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161393e196dd15---jomofapuxokawivuposuniso.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/19573755927.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/21977142568.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a3af844b9---18261684428.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/1f6ac918060bc71e3ec9a9d5d80de89e.pdfIn PDF document text
    • https://network-italia.it/file/24392994628.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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 18344 bytes
SHA-256: 6980cb3a1bb052d39088d22f0e5d4899c336a5b7401a70cab55385ed96ab7a44
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 10836 bytes
SHA-256: 5e835769ce470afe99560a3fb24743c74f8092203358f16276bbcf15caeda241

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