Malicious PDF — malware analysis report

Static analysis result for SHA-256 b093c64468e81abb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 02:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d561672d52b2d736906d0042fa5fc9a3 SHA-1: f050f2a3f0d73ac38c5abc8545783d16216f71f2 SHA-256: b093c64468e81abb36a8fef1a7ecd216d38cffe51f7f65a429ddabb630d9bb7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://a899.net/userfiles/file/lovelirobixu.pdf
    • http://hgbs.de/userfiles/file/gojuz.pdf
    • http://lednotice.com/userData/board/file/39341776696.pdf
    • https://korovin.org/site/img_ufiles/97317146169.pdf
    • http://huseyindurmuslar.com/images_upload/files/giwekebonolojebilosazifi.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/86693647312.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aed7fb14132bb1656345a42826d21257/42060817129.pdf
    • http://nhatngungoisaoxanh.com/upload/files/49394059793.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/258e2e90ab891cb53f4ff2d058be31ba/gekijibasetuvasawumuraju.pdf
    • http://missteenqueenuk.com/userfiles/file/lupelerekugibuwasuro.pdf
    • http://telegid.tv/userfiles/file/keneredi.pdf
    • http://hitecds.com/userfiles/file/rivetamubafup.pdf
    • http://controlsystemco.com/cache/fck_files/file/liton.pdf
    • http://iranjobex.com/cache/fck_files/file/68300989623.pdf
    • http://affectif.ro/data/Image/file/37951577066.pdf
    • https://dudikom.pl/userfiles/file/28022143593.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zakufomipezesusujusagave.pdf
    • http://gniortho.com/files/Upload/file/rokarij.pdf
    • http://www.moyekolodin.com/files/88654608523.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/93875568054.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ptc9t2b873djocm4v304gfqkf4/75074127123.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e152743c09---3239222010.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ed404695b081a602a14e596cc5be3f0/foraxefu.pdf
    • http://yacpa.org/yacpafiles/file/dukadafegoxen.pdf
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630453080/files/1252982093.pdf
    • https://deloge-nt.fr/media/photo/file/numaniwajolibovomejunup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tekken+3+obb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce19.bin
93d7ca88e4d73c9d7ae4bd5cc30d952280dc187976ed39f41c2f16d46877fd7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 17716 bytes
font_01_sfnt_off0000fc52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 16792 bytes
font_02_sfnt_off00011468.bin
76e9aabe9ef80cc926a4a8d54772cf67da236d005c4fa4c13759520f100cb93d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 9800 bytes