Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed8234fe669eac0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 05:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d56ed9f4e07d108d92270b7555d0dfd7 SHA-1: 7a2113d0e050d9e3a40d416714f0ab42bdd50bad SHA-256: aed8234fe669eac013910992d8bed2681f7d74d3927d471fc868f6c3d6d1391e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, directing users to external URLs such as 'https://irlanc.ru/uplcv?utm_term=pg3d+mod+launcher+download'. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests these links are used for SEO manipulation or to host malicious content on compromised sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=pg3d+mod+launcher+download PDF link annotation
    • http://pngroup.pl/ckfinder/userfiles/files/1917285689.pdfIn PDF document text
    • https://thietbigas.net/media/files/lelowenenineturi.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zunobowosafedokivola.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161310a6e88b08---40641757703.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/kenesotalak.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/gizogu.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210908235316010232zi6bv.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0f3b65cf---gagikalepaxi.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wifazoga.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/zisolikoxoduvefebukis.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/jerijixanore.pdfIn PDF document text
    • https://baglab.pl/galeria/file/81580386787.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/dizewezepe.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/65756398549.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/49710331092.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/298bb98f7d43afe46042b19c82ff49dc/61905822893.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/91528196094.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/71200664937.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/51023976915.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/vemibemekuxosuduwuf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kikidolisutu.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/36479257775.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331cd65f3f1---sunogu.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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 18828 bytes
SHA-256: 4a8c0666f3eba250fe3ba57a75d12f4dd82546ab2da26275d1d776547f130cca
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 10816 bytes
SHA-256: 5baafdeea4a5671f7f2c1934cff51c3db3c3721d06ba608caa50d5eeea15b49f

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