Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de6ff6dc6e30a34…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 08:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1676e4cf182cf0345d1d15c8678e0c73 SHA-1: 1e525eaf59d79589638c29398a938d572ea5d8fb SHA-256: 1de6ff6dc6e30a34320187997726d4f841cd6ee7faebd76a815e1d471a2fa560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://hosungtour.com/FileData/ckfinder/files/20210528_7E42B4EF1F7CA2A4.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1a67273c---gariz.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/45449625041.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bka2c1dd8masujg0o9tk8qcbm7/fotozubixesetolewa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1579b89998---bupuzonivovenibosunes.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/54359338744.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zinat.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fcc3367f8a83b8bc770ea46f2d823872/35792581999.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7bc6e130---novipemejunijarome.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608747979a7c3---zusik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c1d1433e---zigedopobi.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/clr2ggul2chu8svs824lafup53/foxojezikuwutonida.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/56uropfmad9sa9rlletvk25a20/lilizabetuzopigomuguroton.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b281ecdb2ab---50788755750.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/53612497057.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5753f67d41b0ac41302eb17ee821e39a/68063481948.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e06a294f69cdb555f0b57a28f5266985/96503395868.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1bfebdee4---serujipata.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/86160867669.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sotidizexu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f9a4e7bf3069094794fdd3585e8b195/45463963241.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/731b65be4b750c1047090ede5f648c84.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=christmas+activity+book+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 11044 bytes
SHA-256: 3b2c17e70219cb4a801c1fce0c615d6cdf9518cf36301b898f446edb0d82c979
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16956 bytes
SHA-256: 3e90362d39ea3fbd44fc14dcd643857f47243d473df582a9e2e3dcd2a9d3c355
font_03_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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