Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec4b86cb8eed964…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 07:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ce124ad7d8cfc3d0fbeb5424c85310e SHA-1: 4c40f00fa9c54f7d79ee322e0bb5325484004af3 SHA-256: 7ec4b86cb8eed964998a3e6c6e57e82e1eb233917f1a29b04ad32da8cd2ed967
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7277

Heuristics 5

  • 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
  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qh4he01piqo8t7qnpmfegmg91/52100046276.pdf In PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210818_7C9053D9423D6065.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ndrorscp86o7si3bom3bbaf9q3/30409229965.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/82656fae1da805e603713c5a07ff1801/47670156744.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607528b0663f3---28191317155.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pofawosaziderovidepusolav.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e762ba1bb8---34310522243.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e39a8434e---43760799668.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964bfc17703---panosukerujate.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/l5p212og0ij748jth0cj0n1283/xafikawixaladisonegezos.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/sunufon.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1629759875_1.pdfIn PDF document text
    • http://saptpadi.com/files/file/kuwozuvibokobixapekela.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/42858351767.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/kirewibawepa.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/subamunibiwoxufinelonod.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a9da7f7d---76288226087.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/vaxuvebezapipaworufu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d5bdb2a6---30548293426.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jilinizexiroxe.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/wafuvolulalo.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/pogijoxivuwazugazuxexej.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4693f9ffab---dawafulivewelejawowejubi.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/23417469269.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/45628614496.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/38002873793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=2011+chevy+cruze+service+manual+pdf+freePDF link annotation
    • 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_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 11204 bytes
SHA-256: 67a3f7000736e73885385789fc9d12bdc1a5e352f1eb44dcdab8d28e67566845
font_02_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 16204 bytes
SHA-256: 93d3c8bd5716c25b43a97ca491d7d39ab65680f50b4e0df18d2b9fea632a9dbf