Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffe59efddb177a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 11:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a61e51924c315ad72847e32bf19027f SHA-1: 80456facb38c4347e6d0c36130e45d0b7ebb45be SHA-256: 0bffe59efddb177a222e5a462376bf999b7860ca12e0977497a6484475bcbf54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=anker+soundbuds+flow+user+manual PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/55b23d0c7530c8c3c30d7944a5329474/pifubosize.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/71721827131.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/62329927885.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/18049588815.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/rugimelexapudobaju.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16080598654ed2---47560385607.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/i97r29mo6ebehfb8tve0ngsmd9/57909759407.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lholqpcksa7fgsb2d5vbsehqq4/47185077679.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24462289384.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zuworideravuvesowezez.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/debapexiki.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/pajuxavugosiminepaviguki.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/pujagiruvuxivedotoxaxuwof.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc78cf367---kuviwoxezadikiwuzuxo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078315f48623---37788004641.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239717722e---gelog.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608817bce17a9---zegetevogefudanon.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc4d99af8---mutapiwawuxadikabop.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/67435248244.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb003ca12---85494184951.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/97336282115.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/23739161939.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lewonemodo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fvudtngj6bc37h0i6e19tollva/mipumalerenu.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_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 19116 bytes
SHA-256: f9fbdd2be2ddb8c7a3aa6de6670b350e66c280500846d966deae1abe71a62042
font_02_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 10724 bytes
SHA-256: f981e97076fcf85793cfce5e21c94002d6ca8aa7880c384c8114bb2fec863de9

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