Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed31810755194cb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 04:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a585a04073004ac96e312b70db3cbcf SHA-1: b209773e8ea9eade3ff38324706d95bdf108d143 SHA-256: 2ed31810755194cb8e48c795914e56c9878b4dd4e5d9717d1a829d6efec748b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous heuristic firings related to compromised CMS uploads and link farms. The embedded URLs, such as http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/95mi40v73582aumdmk1e3o21n2/jikibidisilumituk.pdf, likely lead to malicious payloads or phishing sites. ClamAV detection further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/95mi40v73582aumdmk1e3o21n2/jikibidisilumituk.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ca8fe7da1073ff3575888f8150e29342/37994614986.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611125035777d---69511077478.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/h2d151ubpvnk1ng70f25o1detf/tulinegufibavejuvemo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/efcd8548c531936cd0c3a31f9ee781c4/nekudovigumimorojowe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/aecfda37b3624d16c7e886b57fa35a22/dimuwopapuv.pdfIn PDF document text
    • http://araonline.hu/uploads/file/14582750288.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/vipafosiwezegiwulanaduxil.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609de78fa742c---xaxibesu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/temefenovak.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46cb6dd89---dutazokajaditobelaliwazaj.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/76a31dddde23e34160d6dd47de8f57b9/59351132672.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/38967953650.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sipivoza.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafad8947df---joruwemujezikavepa.pdfIn PDF document text
    • http://domplus.su/userfiles/files/96711801271.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ae04dd62---jitapezosebinudazudefaki.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6f34f75cf194ec94335fbb902fbe87dc/45800887791.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210619_121236_4581.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zirezedudininela.pdfIn PDF document text
    • http://www.pvvc.cz/files/gunemexizirurorupal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=an+introductory+statementPDF 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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 10680 bytes
SHA-256: b4b3fb29675b1ca216a3de4fd3ac2f922de17b05bf81b01ec3f85e5081fe2390
font_02_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 17552 bytes
SHA-256: 4606edf640b51c4b650263ecdff131416eae990a94be26ed81623f1412eb0cca