Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b88033d4b1a8d6d…

MALICIOUS

PDF

93.3 KB Created: 2021-07-31 02:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b34f6d3d4172cb8523d616f2a2195ded SHA-1: 8a18a3d4a526cb2da9fc1cd49ff9f067d0411a80 SHA-256: 6b88033d4b1a8d6d77357f5192b8e5d7b534b214bb6ba413fa5b7afe38864792
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sharmtocairo.com/userfiles/files/95853164882.pdf In PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/nonavireduvoxinavu.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/kagazupogozaweputo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8afd5ba3---33357413405.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052102453770554.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/porusakapefipugumuwitase.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/96362204468.pdfIn PDF document text
    • http://vce34.ru/attachments/file/fawizovekuvobematepagorep.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd04e78de2---sakiliduzo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cc22da340541a6f403c7086d3d66674/24941696279.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nbvsvmrilc80g5k309oe3264rj/23536343193.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/mibagibenafuranewabupi.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/bapofanuxofabopeguk.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/26767708819.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/add72fb6ab8efa72113af4c910b9876f/keritesokojogugi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f491aaf944---kitofoza.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0787bac49---mosesojowerosidisid.pdfIn PDF document text
    • http://allasclub.com/campannas/file/13826126579.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/lerubemefeliv.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pfj9rsvniti4i8o3ihiigk4pv2/bexuvorovutezatakovewuwoj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xujokatitipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=christian+creation+story+ks2+activitiesPDF 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_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 17500 bytes
SHA-256: 7ff007055d5bdb16b82e1ccef16c8834a3eb4ba17c2efb7767932bf1ee111849
font_01_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 10704 bytes
SHA-256: a2a2bc5b1586cd0b59c984d4ec6b1ae131e8cdf05f306a3ac942fa2f5753428d
font_02_sfnt_off00014cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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