Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0b770440835e31…

MALICIOUS

PDF

71.4 KB Created: 2021-06-27 02:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2035a0970868d7e1b507cabc2fea5da0 SHA-1: 42079aaff7ac05f771c6ec68cbcd2d0e43af425b SHA-256: 5d0b770440835e31ceea2e71167faa9cb70154014940e36533a8c16800a90f92
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The presence of embedded JavaScript and the ML classifier's high confidence score, along with ClamAV detection as a phishing trojan, strongly indicate malicious intent. The document likely serves as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=clipart+have+a+nice+day
    • http://rymwid-training.com/userfiles/file/bepofutewafegijanixivojem.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/169e3efbf236e465f1cafc81be4b3b94/dapelovelodosizesukalova.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/xedasitinupitexizaxowe.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e2713c5e---xulifoxosejinuze.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9qac7sqau9pij01jobdb7pv69g/25988105880.pdf
    • http://accronline.com/userfiles/file/zopovurupobegoxenam.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f298fdb4db---turitamepok.pdf
    • https://digireg.cz/upload/40200950453.pdf
    • http://megat.pl/uploaded/fck_files/file/woxodaxu.pdf
    • http://narnivet.com/userfiles/files/jivubi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd4f1cf80---71567257213.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/pawaragoz.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856cd2ca817---57211738921.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/19960362661.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074775c954c1---xanovisevu.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/dme00rk3rjvf8c0mulgsrurplc/tebobiredizutomigo.pdf
    • https://universal4shipping.net/userfiles/file/35805131449.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f105aa2157---mukixubopirujapiwav.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1026b2137d72119c2571203ee454da14/62789469459.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee8b2cecd9bd398a2eaa3b36f951ef21/21041230218.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21050916205052165538jp67.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f20e6b91beda7e853c4c2f6d4f72d67f/ropogixijejikevozemif.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1d68f3e59---vadapuwuvez.pdf
    • http://omonetach.pl/foto/ilustracje/file/jezukozu.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bad4c7c072ed19575b0b7e36689ee8ee/27481598190.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d6.bin
bd71dcd7c8218eeecbdc5aae5b766b934d9f24dc3b16c505e5f77e53ae102ef9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D6 15516 bytes
font_01_sfnt_off0000e05c.bin
bf95763e2de53c11b5eefac5c02825c4a919da5e7fc1f050c1fdffb049a7187f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 10536 bytes
font_02_sfnt_off0000f857.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 16792 bytes