Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4925fe0cb4f7245…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 21:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f399b479ba279767540012bcd9256e07 SHA-1: 7109534f615a28541c5b1a604e29ff3a532e6469 SHA-256: a4925fe0cb4f724575c0f307756c7e894f4df343b6f8b5663f53bd4f31b73ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=indicate+the+standard+units+for+measuring+length+mass+volume+and+temperature+in+the+metric+system PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6d2t1rotsl9q15b8vtua36ugo2/61061179797.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a5d0045b80b74ac42432803c726f46/55332024700.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/32355078409.pdfIn PDF document text
    • https://edarky.net/data/file/vamepoxekotawarov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ev17c3k56oibp7c0qk5cj5jqm1/68067103318.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/00feaa0614a5004fe80788167e51d641/gawuxolekaxuvaforika.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087196ec4625---85025592657.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99c3c5fe5---79320479381.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d79d27f7f---jideremonapisodexapurobup.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/furekafibafaxali.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7927d16d---27027167979.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m1op1cmjishp8u36va49hrtre6/lomugako.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1b972c72215f9caa816c395ac36e8926/wakimivumusenapomer.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kozoxemekawopujobanetu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/tifipozigaripuf.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/lenexela.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/44820188248.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993faaa22d2---zuduxiwozodelubefigefegiz.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/4964185666.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644c017704---rumob.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nobasiwazekepudizij.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c95a019b8---tiporojuduj.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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 17480 bytes
SHA-256: 593107323905a5724aee8992a20ed99d315cf21b51a6209a172ad69f835b0d13
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 11300 bytes
SHA-256: 77cb30d479edf042cb2bce82c66ed24095abfacbb32d825ecad083bbeb91a95f

Open this report in the interactive analyzer, or submit your own file for analysis.