Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e9e363946ff878…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 17:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7fa891fefa5d39369ff0ff0f6e10a3f5 SHA-1: 84a889d9d27e6089af427bc7178d3f88827dc675 SHA-256: d1e9e363946ff878bedbb608cc0d09ec8fc6806df91809e431a0cfc27c457d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=how+to+edit+pictures+on+android+phone PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/51fa17266ee43e29925bda619338eeb5/14670669228.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/44076724512.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cb5cf24f06e6be837d429b0d311df107/judum.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/veziwob.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091613303373499.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/18938779812.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134377bcba9b---gizixovetarav.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/48693263655.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/biwaf.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/vabusuzagitikizozob.pdfIn PDF document text
    • http://newo.ru/files/files/nukadawusazolize.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/78196541002.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139631f15c94---31760393326.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/joserinoponamunapal.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/dinutidadowukame.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/85260699137.pdfIn PDF document text
    • http://rapet.hu/files/70806352451.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344680b7e81---foketulexekubelozepaj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/nasemogowasiga.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/66691181387.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/87076868014.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zodete.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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 17620 bytes
SHA-256: 4bd4e879501a30d9eb31736e40661bf28e8c230fecfc3c8670bd0a81df67d7b7
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 10740 bytes
SHA-256: 1c5bf4262a60cddf8adda620e9da8b5c319f9f7ff592389569ffaa6b67660bd3
font_02_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1