Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8326a817eae1ac9…

MALICIOUS

PDF

83.3 KB Created: 2021-10-06 08:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5203a189e8b66a79c46b02fa449218c1 SHA-1: fb162ce5dc3dbc10253286a1d65b9bac6925c311 SHA-256: e8326a817eae1ac99f5592f1d641baaf4f38ac35fca67ac961e63d9cd03db655
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to potentially compromised websites, including one hosted on a compromised CMS upload storage. These links likely serve as a lure to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://majubesar.net/contents/files/41178938957.pdf In PDF document text
    • http://humanlitech.com/files/files/nesiwoliranufobe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6c6eed4c4---70978322630.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/zunanofojubut.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/55957848946.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/63988187766.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/87878215415.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/18900143962.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f887e63255ae0ee55682b2b7ded20c74/16208470045.pdfIn PDF document text
    • https://hssanesteban.cl/files/leselopawabivipudukuxar.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3e8eb9e3a---vaxepiruxixunefipu.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/66878104763.pdfIn PDF document text
    • https://endobible.com/userfiles/file/18674316890.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/76924801025.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/68561505216.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/18001432455.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/xumazetotevekidagodibux.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20211004144657_0g3tnl.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/mumamedoz.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1193690977614361a164fb4.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/74924339357.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/rason.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/segorubivobimo.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/99980214452.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904034614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=though+we+gotta+say+goodbye+for+the+summerPDF 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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 20672 bytes
SHA-256: 3a1044efbf6302fe3905f6d690b6b1dcead74099597cc0cf980bf4f7620b409c
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 10964 bytes
SHA-256: 750b7761667dad2a10eb3c747cca15bebdad41f075ce089a221a4a96cb2b53cf

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