Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabcf7c0d9397475…

MALICIOUS

PDF

86.5 KB Created: 2021-07-04 15:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c37b2655dfec5adf5d6623d05527ddb8 SHA-1: a61f5b491522077bd2863ece8c205f3c1811d559 SHA-256: cabcf7c0d9397475d5fda37bc25baeeff22a0cda8a743d996b158e687d68bb09
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable or compromised hosting, likely intended to lure users to malicious sites. The presence of multiple distinct hosts and UTM parameters suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://saatyapi.com/upload/ckfinder/files/84670995959.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/01kv0c0pl6af9b47pa0ttb1ng4/todisuwe.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/8989706516.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/11494694133.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d599191496---lerefapag.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/95963003196.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5kcajdj9ri7bhsqu18t3qrg8v/fuxenazaki.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8b7a86cc---xonat.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/41682208792.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pererarapabitejefik.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816e61add---88347252567.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/iosgbg1f41rejnnokntr7f6rg4/votosafem.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zatipotoxuvudemaz.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/87236391389.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c755e286ab9---sazesivuwowewajozolowapuf.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/narofavusadirutorizufomig.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/5b78ef7ff309b08fe6af25188e9825ee/74223611938.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/65227708159.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da45ee46880122ab50c810e1fa900e3e/vazepovevinusivipid.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/naterub.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5c84b04c---xufobefim.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nato07dvor1b42mur8qs9tsd03/regatazikonijubovebuban.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/83855787634.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/olr4ul0l669nf5o218ui2t96mg/wuwovojopazoniwuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=founders+parc+eulessPDF 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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 18052 bytes
SHA-256: 3d81dd71bd7ce4096eadacf195aae97eba7128695abd1be54ef7e5b4cc4a4633
font_01_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 10396 bytes
SHA-256: 0f94dd62e20d0e99103295b5c6ae5cfc271e580a915630d4eceaf7c4b978377f

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