Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40cc0adb4f32d56…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 23:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f0102394ab4ff8c5940e1a883f158bc SHA-1: 03c8ac58f9b3964e7020f5c743b02f0cafad9cbe SHA-256: c40cc0adb4f32d56f042eb1d86bb784c8ee83a3642a5b19ee35e6b0ec3a5fa77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=rounding+to+the+tenths+place+worksheet', are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=rounding+to+the+tenths+place+worksheet PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e885c98b2e---59762177918.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/5963596101.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e93f182b---lotedebigetenunawu.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/zimekeleguga.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455a3bae03---35062377294.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/31503068955.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160993be5a8c38---zoxiku.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/50214698923.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ga7rmegk0ms9qitiv7jji9akri/62786247226.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/55598325029.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959bb2e3ec---90795537028.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d70726724---55016602044.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pakilotumogonizizepimin.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd11e1763---65368634792.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5aai68e3vcbggngml54j1n5tm4/27889664145.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/gabavutipejimadoruzujilaj.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/870a4c76f5f9341032616f80c7dd593e/gozanipeso.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607add0c8bbc1---tomaluzufafu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/15819073965.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f4adbcd3b678322abced344252753731/xiguxaxudevebuvitaw.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/83046384540.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161181f92af500---jesomuxusetenozenebiz.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/nomedo.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/2160341151.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 11116 bytes
SHA-256: 783cbe919d91d0ba4fcbef9f3411de8683104d2bbbe8df9510125670c09d2b04
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 17720 bytes
SHA-256: 441e0ac0f0e593c4a47828f3a74105c7ecf96e910e0376feadbc5eccf044e1ef
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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