Malicious PDF — malware analysis report

Static analysis result for SHA-256 6908378ba37e1f0f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 00:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5b8514f4d857a9688b25cb7ee1daa09 SHA-1: 0592990e8a4439c00793da3c3539d813e59ead8e SHA-256: 6908378ba37e1f0f085425557a5e32e9ced785f380c3e148a690e455520be121
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=theory+of+cognitive+development+by+jean+piaget+pdf PDF link annotation
    • http://telegid.tv/userfiles/files/lazegupiperutovod.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613463654e38e---dasazaruwozula.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/68812181155.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756b827d1f---votafilapori.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/lozetiwanas.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/pebapidimeseresepi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161319bbb2df0d---86794529728.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/katuzul.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/lovutanotivobokipog.pdfIn PDF document text
    • https://guijek.com/userfiles/file/sewisemajugariwudatope.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/meberewoxoxozuratan.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/36260321801.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae65b1ea7sact0ir1u7a5rkv1s/47600313434.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/16847925247.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138ace880f48---23231094422.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dc61b0c7398f028b05304ad0e20d6cc4/sogowuwopibijuj.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/94654421163.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/91491878254.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/nakujusudusamet.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/68265308468.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/86104680253.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/22164249364.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/41605295788.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_105635_126.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_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 18204 bytes
SHA-256: 7f944187a6fb4979f0de125330900030af340bb371c3d433878e739c545bbe5f
font_02_sfnt_off0001309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309D 11312 bytes
SHA-256: 70d9113dd3c32cdb8c7a66bc81e3c850b41f91762100febe463c2be89e78a2b4

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