Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d761af46b193c12…

MALICIOUS

PDF

109.5 KB Created: 2021-06-28 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c941c50084c90667f74244fdfafb81f9 SHA-1: 77f0e64f9fc0f8c5d31b642d17cd156a852d5084 SHA-256: 4d761af46b193c1280476c13aa696b1299bfe75797f37035c6fbbeb5fdc20948
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=landscape+of+the+soul+class+11+question+answer PDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082869e303b2---wazanef.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/vigujipuvorabezoj.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/24004610a38c924fdcd0c943f6349f93/29545372369.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e2f0b3710b677fcb1320898d91a425dc/labaraw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe1f7a56b---bozobezewegojivob.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a06e46aa4---11142984690.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0f291380---93933501995.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/pugobik.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/64832211621.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/9316210277.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607461e89319f---vixojupux.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kafijo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca83338529---47642614088.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc458b09d0---70428598805.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/j2jn5p9hutn9d00scnthp25hv0/pikotun.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9c426271---nobodawuvevulixalirugev.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/cf56074258903ea5e903615e0d8868d2/84952976425.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/gijaredepuzuladunonag.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b79446a9---43532475771.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9837a9ce---60181337354.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/43d494032a76d950e928befa33b2422c/nuridivekosipopejamokuw.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef464c702---43063982966.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m4h75t92hnnic11dfk0j2s9r7m/67731277710.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFF 11056 bytes
SHA-256: 5e82e897ecccb821d55963977abaa9d4d801043215971fd46cb5d4b30e23ff53
font_02_sfnt_off0001798f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798F 18324 bytes
SHA-256: 83796ec86576de42909a7f1646ef985ac49dd6bb86a6b931c1a2f677d9940439

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