Malicious PDF — malware analysis report

Static analysis result for SHA-256 8946cb1c7cd878a3…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 10:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b6f2f9b4872107089e5f48666852c9e SHA-1: 1e1db1b5d7e147b3facc6130c2f1148fb4c14f56 SHA-256: 8946cb1c7cd878a3c7267d39fb9201f1b581b8ffb2c14da08d102cff83891b8d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://full-flavors.com/img/Data/file/sapuvexigafaxodunawufake.pdf In PDF document text
    • http://bomtvplus.com/data/board/file/20210511041515.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/de9a854e6e07266590d4cc9113eb8856/litubedoxipomibi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efb715e20---kevexerapad.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/kidivofufo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c174290f50d---73413442225.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad681cfc1---danukujejaxunak.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/10984461917.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/fejuge.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127594305b1a---53252340455.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bufewojomat.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/fajoniw.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4ojp61vd4q6if4erqk4frrj6e4/bisuzijat.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/piludizifajegiwanivozozo.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/10598800526.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d25ebb64---75557567314.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4o7t01u6cbcirbl59b6k5ae7aa/xejakipik.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/37362210810.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/nexifakavipuk.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/milugepem.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/179340bcc0fc31add6778856d8a4feac/8806878157.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/babuvanefajoxulax.pdfIn PDF document text
    • https://micsys.in/userfiles/file/fivezupubokoni.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kejekupad.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/fobaxazelo.pdfIn PDF document text
    • https://carlojans.com/cms/file/julevosotusunisebumovowuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=phantompdf+express+editionPDF 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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 21468 bytes
SHA-256: 20e01e4b65c717eea91ad7646fadfd8a6b0a7f9ecbd39928f5472c251d950f3f
font_01_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10820 bytes
SHA-256: dd2e45724788e6b1733fc251c63053308b67d8837bebb968393da0b3de43249a
font_02_sfnt_off000135ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1