Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d05c8b28d5c7b1…

MALICIOUS

PDF

110.2 KB Created: 2021-07-08 04:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 888140d9aafa241e3068ee98a407ab28 SHA-1: 02827f081060a02c3f0cd73031577870eea7d6e6 SHA-256: e5d05c8b28d5c7b1f54c3ec5ff16db9f28b293165e8bba2ef69e417cfead1c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these link farms. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://tms-technology.com/ckfinder/userfiles/files/mesumigusorowom.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f1af2582---kuluvejufizidalajatekif.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/14159771629.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/naruxabapatemoxorigaj.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/taqbeqab7414u8atb14ibekbrs/11816912652.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ced47a7ee6e513bfe91457a91f863d8c/77266708201.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56578bade---31670318890.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/45624970364.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/54502905214.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hcn12e8gksu46lbi1q52u0j2nj/sosaluxatode.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/zugozuvitigadifizav.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/sarusekuko.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609050afaec6c---zufozipoxikofilozo.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/zegunexebifabalufutilegug.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17e03df7d9---30087896339.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/dbjsnclh0ufm2a8jrlsjkoeef6/razisefuzuluzavizedataz.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea02462213---86266491095.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c62194596d1cb10e31d3a73a24b8f205/tezipodawodo.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/nilojadesejesu.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/73295391830.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/tatanuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=st+crispin+and+crispinianPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 10284 bytes
SHA-256: a80061e7bec7e3d5b61ba6f35f59579650fa66408ed6c4f8b9521d4617a83539
font_01_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 18016 bytes
SHA-256: 2db193899516f32634bf377d785138ad3bd31f0393f9a8e5293e35c5d84e2cb5
font_02_sfnt_off00015fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000177d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D5 19388 bytes
SHA-256: 9e1f6aa7c8a6ddbe3de140831db20da3bf1838cd236cae18bb957c8de075bdd1

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