Malicious PDF — malware analysis report

Static analysis result for SHA-256 41deed9b492c2add…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 668509da37642233d7ff89860f18be35 SHA-1: 64db83d7d2504f585fbcfcbb0b8dc801de56b3fb SHA-256: 41deed9b492c2add7ba330b7e19cadd63649f8938554b661f95a06f697701374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing destinations. The PDF structure itself is also noted for having duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://huntic.ru/uplcv?utm_term=cooku+with+comali+season+1+full+episode PDF link annotation
    • http://agierresrl.it/userfiles/files/13458777384.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/39371784688.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109060835374588.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/529bd73acd5516ebb799b42b1196815c/panitapukagazawegere.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/dulunolifipotilibazib.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613771dbd6f7f---zatovimima.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090814052271.pdfIn PDF document text
    • https://membermimpi.com/contents/files/18572292231.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/retukelokalu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/zedarezosefoxegenurod.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/leveturumoju.pdfIn PDF document text
    • http://theponghop.com/upload/files/nizerupup.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/wemodeporixogirukepisax.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/19892436189.pdfIn PDF document text
    • https://pcetravel.com/files/file/mowolulixif.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907222405870575.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sexome.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134303e67935---29468181462.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38d263444---10402280210.pdfIn PDF document text
    • https://eslms.com/userfiles/file/40690325122.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/99080186567.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/41593428631.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/12275610426.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/majunikulunuga.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_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 17364 bytes
SHA-256: 4714788f199de67e45a79946ff7a259d794a354fb18140f39f754747a648e230
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 11144 bytes
SHA-256: 70ca527196ac49461cc7f51f14f5ff44e73ace9757be42366d5465b58c975172
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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