Malicious PDF — malware analysis report

Static analysis result for SHA-256 653eda91d1f990dc…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 17:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bd361803f081a554d867d31909ca4bce SHA-1: f6af46a70800399249c5ee77493b514de503ace9 SHA-256: 653eda91d1f990dcfa5f793a9c7920f8d1048f55f5ba3c59d542e3d828374618
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://adasms.fr/userfiles/file/83073663864.pdf In PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/56066409347.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ddbace1567fd7cffd034de1f00757194/guvobijev.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8383ee67---49382103521.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/r15buq9uqf6hh306vn167bp9fu/zewagasepabokuvaguwoloku.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/dabifawa.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/286148f0ba064230951b27b8aa16304d/12833051211.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072846a002be---22896623053.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84143cbc---petasipipimu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fixeto.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kizasadotumafuwizani.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/butem.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/35652810782.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f763d174---bezeponajamokipuk.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/15542883179.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vakonalivuvedomenujime.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4323d220---danitogajifodaragi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/57741106140.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/98587476628.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c505ee66fc5---32943814661.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/pepufoval.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u09kt1pdum74fckurmjgorn32k/62421259593.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c164f39313---kevox.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/25846776034.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/16259296914.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q1uehufl4ievo7ma0upqp9shbn/91327925512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=project+risk+management+questions+and+answers+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_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 16500 bytes
SHA-256: 44e4f8aecf826de0b663a462d580900c0b3a5fcca2f1597ccd9a5c99069791cb
font_02_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 11472 bytes
SHA-256: cd5ebe5813719976a77cf4d98f836dbfd56c629145a266a83bfa282846a3749e