Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aff2b94d3e836e…

MALICIOUS

PDF

72.0 KB Created: 2021-06-29 06:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2daab31a93d792e0072d902164ad23ce SHA-1: 78ee69c0bcb8d9d86fa77704ce7da4db1213faa0 SHA-256: 85aff2b94d3e836e8b407da1a47678ff89e86151feef2e680009cf943e8159fb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage. These links are likely intended to lure users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2109

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fe5627e4---vegomubazataxojetamiz.pdf In PDF document text
    • http://skogsformedling.se/bilder_umeny/File/banera.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tufozodo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9f6d5506---pozaniratuveginevope.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ea82fb372237343e62472ae05acba471/nitotewa.pdfIn PDF document text
    • http://ttc-investco.com/img/files/14783800602.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021060713224770554.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854d9d39f4f---pedavorafuvalabulized.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jfb78e0gtodbm19gl2un1jpvlm/71891769337.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607943ee04460---zugizikelozid.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee0585133---kekaze.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/remow.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3367d7f8f771771808bb6796742c67f1/fabizobonukojuleferes.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098795fc3ddf---fevibazoremoxora.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6c9cd8dce2a3a9ddb6b45a75cda83e79/91205365372.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2c84a59d---rerujaxidekajujo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a226d5cce3f---birakoxibebeve.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/79713981993.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cad1e14a---42772342986.pdfIn PDF document text
    • https://invest.pl/userfiles/file/wepibizinodidadu.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/63923300706.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097071986b55---gomed.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/75160687842.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099533370ecb---1811791402.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6f77c44799db6213ac7a4235197a0eca/68710423285.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0954bb98c1d11e0f679e331c6ddd9bc1/vadijox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=think+less+quotesPDF 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_off0000c397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 16892 bytes
SHA-256: 807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10244 bytes
SHA-256: 898fe1a5edde95842cb6d9308c4c8c15550c94a834bf56dcce06686c15e1ad29
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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