Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1c0b2116873b98…

MALICIOUS

PDF

81.5 KB Created: 2021-08-12 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 639e60879bfb30fd52b0f8df6c3be221 SHA-1: f76b5cc839bc36e262d3ba0840ed6be400d364ea SHA-256: 6d1c0b2116873b98fd0c3e5103e4a31296c717468d50e6e788fa91a2d382c063
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. This suggests the document is designed to exploit vulnerabilities or redirect users to malicious sites, likely for credential harvesting or malware distribution. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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://queure.ru/uplcv?utm_term=lullaby+of+birdland+score+pdf PDF link annotation
    • http://reikihaus.com/clients/75291/File/pesaweme.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f93bcc0694d84f332e65936d63aec0fe/jezisuw.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/32939750512.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/6948293632.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/35575701751.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdc5b2c0b---xagatedakurudawite.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/41720549930.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8996dea80---favinikexenaxowelogodex.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0h7r6lmq9ctmlhl0eut0k5vsln/47892084914.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i4mslgm842mdnherbfseh1lec5/98138574111.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/lorariko.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4b82c5ed---zesakifimifasaw.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1f41a2efbfbb974e56217d47ef7fdc77/libameluvisezoz.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/44056567597.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ebj4q674hpufgt2qj2utpp7hdd/tufefiribovorodumixen.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c8c2bcf25fe47cd816ecc9a9a4ba787a/12860669881.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1480e88---66591877532.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/76597450176.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/dizatavavunok.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/gifagosanipevupivetagezav.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdb0a66aa---setojot.pdfIn PDF document text
    • http://mqskin.com/luutru/files/91564409901.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/89287165500.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49504f640---90715341705.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/846636c7e29ee61bc1a94ef09bb5ad28/73081503620.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59185519548.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///20610353556.pdfIn PDF document text
    • 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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10828 bytes
SHA-256: fa00d9844f2f9d4f50a6098a15096e7dd7e47788272d7f715f55c5c4ce940f88
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17412 bytes
SHA-256: 0e2f4276c5299ded6dfb787a9b995c2e4f516e5215fac6866d00c525cbd414fb

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