Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a23c7c0f3bb6d2…

MALICIOUS

PDF

80.4 KB Created: 2021-10-15 00:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 263dfc4b84e5047d5a4263057a771e1f SHA-1: d889e6d4062cffdb6492d40621fa835066dd631e SHA-256: 23a23c7c0f3bb6d2affcffe35a5b65884c064f6bebb74bd5e996d337976af4ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of invoice-related language further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://coretry.ru/uplcv?utm_term=how+to+do+read+receipt+on+outlook PDF link annotation
    • https://inprovitchile.com/ckfinder/userfiles/files/nawiretulebixe.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/96142184795.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/63637033361.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/42426188588.pdfIn PDF document text
    • http://marine-inox.com/i/File/bepegukowoka.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167910da83ee---69762360038.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a81034917---79002188253.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/86985635742.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141369b2f5f4---63281438328.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/togogidijavikasul.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/pazuramasumamevufewipod.pdfIn PDF document text
    • https://brs.jo/userfiles/files/46470500969.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/60301040106.pdfIn PDF document text
    • http://bushurov.ru/images/files/vepukabitisiba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582ecb8aa61---pedixozujovi.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/nodomu.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/guwilawakorajugipopevotuv.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/up3m0ial397rpkdmsd6eass4gd/falomunafitogekele.pdfIn PDF document text
    • https://laps.pl/userfiles/file/57333682127.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/83214833125.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf941796e9---71310675283.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3b4185fdc---74795971168.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021100217531311.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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 17608 bytes
SHA-256: 0339f3222a33bb65794becf86b5a50d70e6dc6f6b2b19de9197de52676be96be
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 10608 bytes
SHA-256: 891289d1f785e5f379c8cf7592fcc84d31342a003a24766ab66a5d7de6df6bc1
font_02_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.