Malicious PDF — malware analysis report

Static analysis result for SHA-256 624e2e79f3ef71dd…

MALICIOUS

PDF

76.6 KB Created: 2021-08-30 03:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dad36ec9838a7febb9f39b131163041 SHA-1: d07361e4a04e8299dbe7798180b9c48e00ab6123 SHA-256: 624e2e79f3ef71ddbc39ab6dcb9673b6744e6bf61a7bcb6ddb9c0870bf749312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these URLs point to compromised WordPress upload directories, suggesting a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=the+hobbit+an+unexpected+journey+extended+edition+online+free PDF link annotation
    • https://alnahamgroup.com/userfiles/file/benodinifof.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/bigiguvugoludoliporedika.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/degaluzunawobelowaxuzekur.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/68888221226.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec16fa03e4---renipebiroxilaxu.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/jatebozapepafotobejowujar.pdfIn PDF document text
    • http://rapet.hu/files/49628320445.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816596d78a1---komekazizabixugunepaguro.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/pitajilipotezaweduzo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/cbc102ae3f37c9026b3d6c8660327767/32422918265.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/4532698961.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/8865651406.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/303901199.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vsivl23q5duloq62067cic8odi/josona.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2f8cb0c07e2cc71773b6a5e6d417a548/jidabakesos.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bae7025e56b---7071840344.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c9465c105be0f68aeab14695d33324e4/rivisufen.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/4088207788.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cae6eda---faxopebifi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/60494521477.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f330a62e03---3323387848.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161172235c0e33---zezef.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/motudobodutirokidowete.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/74981227686.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_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 17320 bytes
SHA-256: 393f1e23a5e3bfae9e4ed553251235ce2ce23d7b420e8ab4c7ba8a7ad237a22a
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 11096 bytes
SHA-256: 6d4be8d7db32f93925ae277d5afbcd3be874018582d06adb4017bd5f916bd16f