Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a10d4964705d2d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 18:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17ff55c4f74017e393c52ae035f11acb SHA-1: de020d2e0475ddd16b37cf13cbc2e372c0a48b53 SHA-256: 93a10d4964705d2d7463286dce22ae244ef7b6a10fd8d272775aca9abd65196a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' in one URL suggests SEO manipulation to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://huntic.ru/uplcv?utm_term=apk+roblox+mod+menu+2021 PDF link annotation
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/53504830847.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/fezajolanigaxelupavinataz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2340968842d639be77927a7614023d21/55709776158.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wowujanokejoziwikeko.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/demepelidivobudepax.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/18875941085.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/66816858684.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zojatebe.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bemofaf.pdfIn PDF document text
    • http://mayjack.com/upload/files/72540660785.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/53a3278574843449f7a8f7dd3b45fc02/87046734272.pdfIn PDF document text
    • https://dhesient.com/media/66625995099.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebd78de484---woremasifukopifaxixodod.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/wupevelibemogu.pdfIn PDF document text
    • http://xn-----6kcftbqgtghjv5bf5gydg7b.xn--p1ai/files/files/58802180898.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vefubugudaliwuz.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/sikobiwuzaw.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/wedujavajalo.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/xizepakepugeworuz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5d449c0d6ebd71d7e801daffcbeba9bc/27670195359.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/13252271574.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/zosil.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/58862387323.pdfIn PDF document text
    • http://harlit.com/upfiles/file/74041064526In 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_off0000b28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28F 15776 bytes
SHA-256: 849050af5da5d48097f4a401b975c54c4d4cb3c4f81a6ad76298bf22e5304190
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10744 bytes
SHA-256: 1808a5463d883e3fcf2099523a54b9b23dd540ea5b44ab00c3646dbc235ba7d2