Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ba2626939c320a…

MALICIOUS

PDF

91.4 KB Created: 2021-08-13 21:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6b203d5b966c32c623029c1576c3142 SHA-1: 5a11d2f62fc6dbf1f463a21ad9a8d741b8572993 SHA-256: 88ba2626939c320a8d0ed476a2fb242aeb60f9cfa7ed15da37e43df30ea9a56d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards techniques like Spearphishing Attachment (T1566.001) and potentially Command and Scripting Interpreter (T1059.007) if JavaScript was used internally to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9998bb00---60621847188.pdf In PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/2977890040.pdfIn PDF document text
    • http://www.polni.si/Images/files/nilixizari.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c88258fc4---xopakipu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h0tds3lesa9bom31213e64ppr6/damupepemegotegivi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/zitipowuma.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ba832aa0---xomilolig.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5173b7d0e4---72008616972.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3f4ea58ab7f7985cf07b71b747e6e6fd/85340724578.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5cbc8505f1d09888785ef29478fb215e/buxofalilimifirod.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/2750118516de41761ae8cc345d3ff47c/84090697692.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/24337963726.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/40154682195.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/sepivije.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tervfmc92t4p670cedmoj69gsn/3513317062.pdfIn PDF document text
    • http://idcla.net/upload/files/vonafesulukulepotulo.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/vivuzebefadoxeloxeru.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/9945952188.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/66749290319.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/87bef0bda9225c0a751da84f29ea8a13/parisubetumapufoj.pdfIn PDF document text
    • https://le27.fr/docs/file/lefunibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+fix+a+stuck+android+boot+screenPDF 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_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 17256 bytes
SHA-256: 82526e611536c8a40d2c96dd789e75002d72812406c5edac7c8982e0896fbed3
font_01_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 10932 bytes
SHA-256: 8baf9e9f389b82f7aeac130cec80290945e86e7222f08cddaef07cda23ff752e
font_02_sfnt_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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