Malicious PDF — malware analysis report

Static analysis result for SHA-256 bece659c01836a2f…

MALICIOUS

PDF

127.8 KB Created: 2021-09-08 11:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7781db44b76de130fe2e2f002ae9fea SHA-1: 86f7a1a59538e02ac99fe7215db2d6391c014224 SHA-256: bece659c01836a2f71f1f62bb3cc58fc0a4b7ea190df0b3aa1796decbe1a6f08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076edafaa259---vikapefubaw.pdf In PDF document text
    • http://bradzo-ep.com/uploads/files/56988200934.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073336d1b0---dufogufabol.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gojof.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/20864540898.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/52942158785.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/tigevimutejefuxiruzowo.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/rovivagakamadajexo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/levevoloxesinomapesur.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jepiralamonebikixakikux.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa712f409---281876135.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ffd33b073---54263467968.pdfIn PDF document text
    • http://imi.vc/upload/files/78021133903.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/burujasivo.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/kikatexalisutizifuxuli.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1367e822e7196b31bb848668971f8dd7/37072458075.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fupupajurer.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/pomixuwerivo.pdfIn PDF document text
    • https://kawanmto.com/contents//files/73738172435.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sb0f13ko9mvkt8jhuuhc166lc3/7376130627.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbdafdedf8---ridekiro.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/83226895775.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f3e45b4dde5d80723809baf97ccb8c10/besazisitexomolavolu.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/27737546803.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/91142150497.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6d7d5ac8---nopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ferrocement+boat+pdfPDF 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_off000193b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001abc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC4 17464 bytes
SHA-256: c69055c92ea9ce58c5a957f27bc16eb20ac4e96c644d6539184a7c82f4d81b9f
font_02_sfnt_off0001d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D94D 10592 bytes
SHA-256: 6bc5d0b8e965a69f1bae0751adae26390f4e30d221b884da1de4453a4558b762

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