Malicious PDF — malware analysis report

Static analysis result for SHA-256 015d17dee4eac0a1…

MALICIOUS

PDF

81.3 KB Created: 2021-10-06 16:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95a7b62b5f0fcb609f2e17b6f18572f2 SHA-1: 55a54f86a815bd549cec516d8f93af24bb5ea77e SHA-256: 015d17dee4eac0a1a9d1b04380bda1b5a76d6d21fea9a3b8e043436e692dc5a4
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 WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://zatuchlina.cz/upload/file/44936813527.pdf In PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/85589998420.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/wewasituniten.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/kodelodosusekamofubojo.pdfIn PDF document text
    • http://regmac.net/userfiles/files/41864806109.pdfIn PDF document text
    • http://vtaky.sk/media/file/94184544909.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/51512759494.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/932a5015e04f4e50ea6828f2d27d44d6/kukogosasunozifig.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/50973143520.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/teloponavikepebanimoma.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/palisoza.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/gojelutogutakuvi.pdfIn PDF document text
    • https://euchebnici.com/img/file/fotepokokesamesigup.pdfIn PDF document text
    • http://mfahk.com/upload/files/fipiwaxiwurubetif.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1f8d2cec---ratomopegexogixu.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/jedafotewoxerujopafu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89ea2a30---vezasatow.pdfIn PDF document text
    • http://htwy.com/upload/file/72006619348.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/77074801516.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0a067c0a68bb71b35d5065403c19da22/xidujudikevinukavekadik.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/39022530377.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/rudusovelawinugakonupuwa.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/pesodevanel.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/sapoxosaritagar.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/66418209586.pdfIn PDF document text
    • http://tatooazh.ru/files/files/80527126129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=body+language+images+and+their+meaningsPDF 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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 18448 bytes
SHA-256: ef747ec1c36bdd7e65773568bac73a2a3956a2506bba9fda34fa4eb84bfdb242
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 10964 bytes
SHA-256: 743b25ae1b4f5129d79e9f277d257c96d357424920ac0ca93db95baf43565d7c