Malicious PDF — malware analysis report

Static analysis result for SHA-256 7087f0140f44ea84…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 21:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa24f67bf59f5b60b8279f601544ae30 SHA-1: 0891a9bed8d1900f8c489901466516872b259ccf SHA-256: 7087f0140f44ea849e61e29e6ebf70d5d7a4306bb0c808d888d1e8d38716a4f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=second+conditional+exercises+printable+pdf PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ha51l22od362qpq6an3j6ktakv/kutulux.pdfIn PDF document text
    • http://mm-podium.ro/userfiles/file/ferovomejapuj.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/fatovisujasuvitevew.pdfIn PDF document text
    • http://word.mn/uploads/assets/24967267228.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/05181eb941c47648d10446ee066f756e/kukixubasonobiwet.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/nixumiber.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/kagukakukifepofit.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/22218184673.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f058ada545---37273714046.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/26097782769.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49a45a9d5958c21b2b457305675b11e7/70638181718.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/1330704696.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/10489737418.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5qmgor960rrv8l936ieelorhq0/xudubawuzunaniveroze.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202162212123.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a306161eac89a2ed2e7b9b5f92806580/45032541226.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/jagexezak.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/54669687044.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/zokowevomevilena.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/gemiz.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/61230171724.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b656772d---xuwagirobepelenodegewo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd556734ed---lisojofaraxedulokufi.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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10932 bytes
SHA-256: de3746bf1f3f8e5f2a7e7dfd1818fb42989727791921165e88357f845f4f7217
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 17472 bytes
SHA-256: e78f434783e03d27e01d5a3b20a2d96befed944e9f184e7fa9031632e9517158
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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