Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb9b60d10e9756…

MALICIOUS

PDF

76.5 KB Created: 2021-07-06 02:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ace2fef313ac57fda4c689880a528af1 SHA-1: 6f91aa590f1bc76a315743eb3ee7dc37dffa3388 SHA-256: d6cb9b60d10e97563559af6dfb296dd3ea8e11e5111d824372c8b504c0db06f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://beijingxinzhi.com/userfiles/file/20210526130355_795093752.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a01367f2c8a---13722971031.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7978f090069ee116257e071775b50342/nufagugewepevopoduje.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cf692393b1dd22ca880b7cdd68e6a94a/54526031823.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/14848935254.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/81781214349.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/95dd53944c17c5f1a5736ec709b5435e/81816103581.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e8824dba6973d9ecec635afc5dff6724/41260857515.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5njpac10ugnm52o2h887v970ih/sogemuxarawapuzuwax.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/543f5a3739cc73f55d8873f830751ab5/gumelazasubulonekedo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074409cec5fc---19700666510.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dd40eb5acfbd2dd09abe9ea981fd0a78/nudizamoxawilib.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/gogabewiroviragazafar.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/8245459912.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/705bcd2e27414d378fe6b49d76af10d2/zepazoto.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074425e0c1b8---zolelinosiz.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6552661c3f249dea5ae2ee8827c264ba/71218092637.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/76042827709.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/5106600702.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6ec35c3ec7c2dd703f87d64fce84a239/naduke.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/44820912502.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5db12539---mitafirop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=no+more+tears+iron+maidenPDF 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_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10340 bytes
SHA-256: 5ce0160c45a5a1a0cfa55dd2a3db5f0de3a555db7ba0a446a739a1c23c6f4e45
font_02_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 18888 bytes
SHA-256: 0da1908fa2fdea8aaec77ed2aaed0e779686614da17ef7109708a4a45ebfbc92

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