Malicious PDF — malware analysis report

Static analysis result for SHA-256 4686795b0f907027…

MALICIOUS

PDF

96.6 KB Created: 2021-06-29 00:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a731d09194c81cfff68a3b40e5924e8 SHA-1: 933c2dbda18f7231e4fb6a51f26a6cb0cd3dff8f SHA-256: 4686795b0f90702747ca9b505bcde0bbf771db68359e3a226f67c6cb95702502
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://sharon-barron.com/userfiles/files/54011947442.pdf In PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/89520440553.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607598becb21e---logonoxowejepulilezatovin.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/jezagenutowigiverabiwo.pdfIn PDF document text
    • http://sieuthibds.net/images/files/7870101507.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/pixudepibukatiburavip.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vge9mv47km52trb43vahh7hdb7/siwar.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/41318503213.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084b37732659---87108645690.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c7368423---53882876438.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/43899112408.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff26cc3503---nakototalijexobo.pdfIn PDF document text
    • http://apcmagon.com/userfiles/sasozikudinasuvowuteduka.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/82105726201.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/4747879796.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0288c85234---piwojuwigu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3036e9a4d---rulakuwonidoganogiwumi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ripopesugufosuviwegasa.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/sawufuzobekibexukokuwazi.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210605175822.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607703eaa7d16---53138582514.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b179e2bf---66021299096.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/1064374574.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ac79a64d---kubosirunijewewileseburur.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/48276389618.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c918329e44d---dejiridatizaxe.pdfIn PDF document text
    • http://newo.ru/files/files/bepewurite.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/60158144280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sample+lease+termination+letter+to+tenantPDF 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_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 17316 bytes
SHA-256: e8f2c1a45c63738d0d515afef4e6d21bde767c2a95aee34491d92bd8ae2bb348
font_01_sfnt_off0001432e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B45 10488 bytes
SHA-256: ae48624ed52fdcbdb0498f446be3ba785adc8514ddfaa505c9859a860a1b993b