Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c0117b26b1b14b…

MALICIOUS

PDF

92.7 KB Created: 2021-09-06 16:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 333a26875b1452eb5900d368dc41a374 SHA-1: 83d4bf70ca460c2411fd4bc6fde117c3041ffa59 SHA-256: f1c0117b26b1b14bc3d510f3f1cefb2f87751ac42dbe3afc8e06c2613a39b472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The presence of numerous links on various domains suggests an attempt to distribute malicious content widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://93564497.com/userfiles/47162352082.pdf In PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/58488164380.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d6994c0---nodifojowaronanebesuv.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/kujevenisabiv.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/patomomibezexunutora.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/6278896670.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/3537071423.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pokenosifaporubuvewob.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/befamidujavofezubi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210513110654188134bg4obx.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/95184825929.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e49869bae13---rawamolivepozipipajewe.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/jexoruvewimag.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/31019010049.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/texoxironizojelakesixinuv.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abbc8691f50044b940d6447b1460459d/zepume.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vapeziju.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/57477770686.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0l7ehujv7lf7p62rbsg1cv7pp5/54613632338.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/pogenisovu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j80htag2gddr5vvvjafo8qo1v6/tuwezefadaderov.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/60386389230.pdfIn PDF document text
    • http://isgsrl.it/images/file/15670402605.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/84738742453.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd15464d4---23067237353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tally+erp+9+pdf+notes+in+englishPDF 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_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 11020 bytes
SHA-256: d2d98441c9993733bcb68ecf1af7011bf6a193259757ffda35615fc38501e045
font_02_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 18504 bytes
SHA-256: 5ebf4c2801ae47cf1dd7580fa93eba30c3dca28aa00efa382321c731d710c6fa