Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25534b59c94fd68…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 09:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eb0cc81ceb2ee9ed72bdd932769be72 SHA-1: 7e4597386778eb44b8d51084276a9879cdabf464 SHA-256: e25534b59c94fd681d3ebfdc008654fa2d318a66a802cb3b983a8909f9f4da76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d2ec82232d29319e08a6cfc32737a1a0/xijizodopewu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223b9d11e0---75464614963.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/juxokarupetudomotatokuram.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/60cf33b707039d873bc1c5cb1e969406/36267666248.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/pekofujevezerogizofep.pdf
    • http://ciccioinpentola.com/userfiles/files/gubebedijofazemalesuwire.pdf
    • https://pharmnet.cz/ckfiles/files/files/38994143274.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb81fb89---55829906877.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fe87b5af8eae36991d7f5e0d9e3e1616/podojelo.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b620b838dc---2542743338.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84751890415.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210919031148.pdf
    • http://hanilkwanla.com/uploads/files/81644159347.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/49346726283.pdf
    • http://biaikatolikus.hu/files/file/gejitutuxawexetilos.pdf
    • https://samowar.ch/upload/file/wataf.pdf
    • http://cncforginghammer.com/d/files/vagij.pdf
    • http://susasoft.com/upload/userfiles/files/32859401546.pdf
    • https://niboparis.com/upload/fckeditor/files/71563074437.pdf
    • http://kco.su/userfiles/file/rovozosisalawazawezezaw.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431cc48d513---56021430870.pdf
    • http://oreoltour.ru/sites/default/files/file/nakuwadujo.pdf
    • https://vmwarts.com/ecovic/file/6355655646.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614807026f7e6---viwexijuzod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ghd+sport+tv+download
    • 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_off0000cdb4.bin
c5a91dfd00e3c91219ca17ab2f9b4a27252bbfe5443403e59010f06350a62e20
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 10456 bytes
font_01_sfnt_off0000e573.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
font_02_sfnt_off0000fd85.bin
f9d94b4e897d87e633aee4d42076769880fa3965dc242c75e027b8c6c608e66b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 17012 bytes