Malicious PDF — malware analysis report

Static analysis result for SHA-256 456f2503c3f47e01…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 00:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f2b5452abf10e3bb9f257f72e8563cb SHA-1: 66a88a80ac0ab20037368d320c8eac049b1bd39d SHA-256: 456f2503c3f47e01925ca12408042b57caabcfcdaf93e84dc17f10beb605f7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, a common tactic for phishing or distributing further malware. Heuristics indicate a high likelihood of malicious intent, with ML and ClamAV flagging it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=google+nexus+screenshot PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb4e45565---menamujatowa.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/17687944546.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gutivubofamoxasuw.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/zeboborividozutuvon.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/23898557937.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/xatamalarumoguzekoboreta.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/givadun.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/34012362690.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/41851914225.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/zijozemodekilurujedanagu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/digobejid.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/17927829196.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/53699406650.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141684774497---rotifajamiminovixazejapaw.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/lapafofivobefarerotum.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0db45f53a---mofopirafavomewuw.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/55602693187.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/1791948646.pdfIn PDF document text
    • https://lapakunited.com/contents/files/dojuwinepizenogu.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/xomoberenil.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905084245.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16145230949e82---rebujefivevew.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/24356058361.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/77066327911.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/24895242948.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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 10496 bytes
SHA-256: a3f8ff58524588bda54fa7137e48c1713592196fb10e926613a01f24add4a840
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 17404 bytes
SHA-256: 4575134d2a362283e3a35463560b7d55ca015ec16dde6b7eef024c61e5172b43
font_02_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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