Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa09e6b95f7a583b…

MALICIOUS

PDF

73.0 KB Created: 2021-08-16 07:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f36773b028e3f3466b2baf7afb1faba SHA-1: b0a9776de0624d07052d4ea6aa578db2c7741a08 SHA-256: fa09e6b95f7a583b77b6f6213ee46e7ec05637317da8fa5530fe99f2f524d0d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=ielts+fever+general+reading+practice+test+16+answers PDF link annotation
    • http://mediaworld.pro/ckfinder/userfiles/files/tizubu.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/1le9vb2h5704ha649fmsceqjhp/62137133876.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cud6pmsemvv87pjdiu6ik1odu4/vukitelivof.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/v3shfecpulha76eco8lk68iue1/72803951247.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0319e38048ffd3aad12ee3db70f3c354/fobad.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l1o0bt8kk7cnck66unshgac1hv/73151238315.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/damolojizigipisinan.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/nulosavaxofodedotexiwina.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7911482726a4280e4121c680a1178231/99369884209.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/26790228929.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/3100152000.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3ad9f8a51e08022f6fb453f26b3273a2/38905998901.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/11844606051.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rabuk.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/92a71561eae71bb470ed2610b4ab63b4/vigovokur.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6135299cea---83373480089.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wejanodipogo.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/safajuzibivor.pdfIn PDF document text
    • http://edgecs.net/documents/dadinezefarezi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/017fd6802db012c888afdd1f64047a03/2804491036.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/nemezixofitufaganisefus.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210721005459.pdfIn PDF document text
    • http://93564497.com/userfiles/3123041174.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01af89094---sasajusitov.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/91125512441.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/fikevu.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_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 11000 bytes
SHA-256: 3fc551a999eea7d7986ad061d105e05690a77781fe1070887bb47e9645e12ea0
font_01_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 15872 bytes
SHA-256: 5f027034c5e618b41f1743191faa82b2056a93a44865afa26478c9b24edce5ce
font_02_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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