Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c48468949c9dcf…

MALICIOUS

PDF

100.7 KB Created: 2021-07-28 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a640cbbbbc5a930d22d47cabd10d19a7 SHA-1: ec420ca578aadd5333603024eaf2e8aea6e6a01e SHA-256: 96c48468949c9dcfcb78080aa8912bb104e206ab869e52fbd1a94a4f4d69f410
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160788e114c14d---gakijuzixulogetesiturula.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d3b87d0b3---vagetetevinedijutovuf.pdfIn PDF document text
    • http://beta-rc.com/upload/files/noxerolilorigeji.pdfIn PDF document text
    • http://bociany.sk/media/file/26703787702.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/pirakuluwudizetinurujusuk.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/14173901393.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f301a66b9---63117418277.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9k14mm793h2btj42c45s5jp72v/gatokuxezekuxevuweb.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/seekiin8n60o5oek0653mltkko/xusisojama.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/navoduzirogamobedazagu.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/34657523264.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/950d5b534a4713962d1f46dd9492587a/64091096156.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/2237450324.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8iv6bdemmc0u4sv4h0ptrlso8/torod.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/fosokobuwawopu.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/46438989634.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85aadcff0a---davujam.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/mupen.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/puzepavomisifinomopuz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957f470cfa6---9892755999.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/30432207785.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/doragekew.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/51489712574.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/9201578569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=smok+rpm40+owners+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 23280 bytes
SHA-256: b8dea53816ecdbd928aaef0e0da3e13076a41f1cc258423a29cd56357683d1ca
font_01_sfnt_off0001537e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B95 10776 bytes
SHA-256: 36705f42d3c77ffef82708dda7c0c041284a7ffaeed893147a8dfb692efa9b12

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