Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e74be3db590354…

MALICIOUS

PDF

79.8 KB Created: 2021-07-05 08:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 10d4924293640864e86169fe6de68c9f SHA-1: 8e1609d9ae0d06b8e703ce94f2eaa23bbdc87ba2 SHA-256: 84e74be3db59035465d5de6dcffbda167d3cbeb3f5ce0fd3c7fce423365336d8
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The presence of both JavaScript and a link farm indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://menlopark.com/wysiwygfiles/file/43002197346.pdf In PDF document text
    • http://goteneplast.se/files/images/file/67609247614.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9b5d81e807a907036956b97faf376e7c/15346390700.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/38sscvni5ad0fp57furj3r8sh8/luneviku.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bewabomuger.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2b350579835a394749974d62a53fec0b/zabonivugizibimilijekaja.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317a94863---2563453878.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/44487829829.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/22e26f121313aea14d33b32053d221bd/11804160104.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/44677020579.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ea9805d9824213dc20962c3d76c563e1/35149367640.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087925d0dbad---fugatozowixugopa.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xuguvizapagodubu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/58b92ab74a2edbee369dfd2745116a08/pebikujebivilojokites.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e88414a8b---41157414725.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/sapivapidetujovobopa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebbea78c6---xatoxinugapufabubagubalu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/473c828c72c80d7aa48dc3d025a290f3/babesejorejafuwom.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/18258462830.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aafb8c26c---78097194338.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xakojofu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b4729fc0---rowisadalozupozisege.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607152bfed26d---tibeximedowemetupotix.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ec2e14f6---fepidugerutuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=will+neutering+help+with+separation+anxietyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 10924 bytes
SHA-256: 6067db759aa67b9545228cc0d58c9789f7446d79dd62734942b3d43f08b7de29

Open this report in the interactive analyzer, or submit your own file for analysis.