Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13e5f6a1fa7f7a8…

MALICIOUS

PDF

93.2 KB Created: 2021-07-28 08:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: da3ff34bf7ffbc3be381be606c8c4393 SHA-1: c7feec06cb7d503600237787fad9b9b30b4933ac SHA-256: e13e5f6a1fa7f7a8d55641e96916f3ffeac867fb9ae27cac2f7277b7da9fb6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077e22bb551e---94290567525.pdf In PDF document text
    • http://classicalgardenornaments.com/uplds/file/lebefilijabimabugarod.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cof7d7l9f0uivugf50ccpj5f01/70549845474.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f59ab60e---supuwufevojodebuloxe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/moxusiwu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/xixunizikesaginuvaxur.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f1be3f9f9da---42691132407.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075383e93e17---puzinuwixojela.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210714_C4D8867D03F673A8.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/b40e8aff298a1d07d924cacdd5cfd500/43882374690.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/zowuxurazupaguwet.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/79432359570.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac7613749f820269f546e68c9e38c0f0/32959885710.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071ade64dd4a---sojuxigepojawolufufimiti.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/77512016676.pdfIn PDF document text
    • http://stl-hk.net/userfiles/lepetizegazisijufami.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/xagit.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/demagelaz.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/063abf03c937822c5a60e408702f3e84/lewefom.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/93755485244.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bedefof.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/84d3d0e63144059d7e94574caff35b30/linezusofisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+ace+the+amazon+leadership+principles+interview+sample+answersPDF 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_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 17812 bytes
SHA-256: 0e53c3752a98e85e0e5cdd9e2fe6c2cb172be328604115cea978438699a3461e
font_01_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 10984 bytes
SHA-256: bc607f3719b8d6b1a7c5e047b7b40f5ffca5652359f7d9326a4595289d75fd84
font_02_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1