Malicious PDF — malware analysis report

Static analysis result for SHA-256 75064bc67d8d84f5…

MALICIOUS

PDF

63.2 KB Created: 2021-06-28 02:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ceef51c42e4c47a9ae62ca60428281ea SHA-1: 0a8ada5921bba5fb6149a5e6402bba6c9576b48e SHA-256: 75064bc67d8d84f5b20d9c8d0e9006894e78c3d6d9e928c3d0433712739de2d8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The heuristic firings indicate a link farm strategy, likely intended to lure users to malicious content or for SEO poisoning. No scripts were extracted, but the nature of the links suggests a potential for further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3819

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=swollen+bumps+on+back+of+tongue PDF link annotation
    • http://memphiscentral1969.com/clients/865565/File/xaziwexiborawe.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/dugitigogu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/lugas.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/22220681773.pdfIn PDF document text
    • http://rld-carbon.ru/file/degibosivi.pdfIn PDF document text
    • http://sowitech.vn/upload/files/36290698746.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/lupomizarivira.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74fcc1f234---79907096606.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070067522775---38149377687.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c80f27de---lidabulapuvuxadiro.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zafulaxulinupatew.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/laravepodaxabimuriza.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/demese.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/giteruzub.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76ff93d11---91058876280.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1ac492f33036663cc4fd31c87db061c9/futiru.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/19545863516.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101ed9f37b---16806166217.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1acd8e0e7---lekafa.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/65916164071.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/41991306ff9886e33eed64c41e5d7775/44178980642.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/wubovesetaxilubetugupojaf.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0cc21870---mekarumelopig.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/39fj9vhc7u8mduv5gclsadknit/38413675787.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b396c6d8eb---78929285119.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607194705c53d---25879208726.pdfIn PDF document text

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