Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fad64b8fbb826d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 21:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92531bd4fe43906263cb530bfcdd1b81 SHA-1: d451718dfb59a116ba7fe3500ddf128844976293 SHA-256: 88fad64b8fbb826d11cba53d8af63bc8ed04a838a989fbae90e558ab9d602f4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which host other PDF files, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37a1376ef0---55439465137.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e11d272e5---mefuxibobexojizevuvugul.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/livikok.pdfIn PDF document text
    • https://baptistfriends.org/media/46068375811.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/pofugonuporalunabifanudez.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/14789620997.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/jafeviwafumenulawo.pdfIn PDF document text
    • https://autotrasportifenoggio.it/file/mizip.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-3/20210803114553625452.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/wawobanoloxomufiginope.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xuxuxeso.pdfIn PDF document text
    • https://avela.md/userfiles/file/kupufubep.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/leteriw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/850e0e5cfc300541bd919cef561465df/63958959602.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c71ed3169120d423a05f5e61b69cb471/65981388297.pdfIn PDF document text
    • https://orrizon.ru/images/file/27392957350.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/276932329.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zajumo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9aa01a560---23602067536.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/coagaj8i0avcn053ffssjkgsc8/wugifetisinisarokagitap.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/risufedixofefotujubupixu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088176278832---72897165829.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/joxekefaturedubiledaxawid.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g29qfskad3286ii1nu6nhilfbf/24320534529.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/jazefugalezumudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=samsung+refrigerator+repair+manual+pdfPDF 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_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 18876 bytes
SHA-256: abf1fa0b5a4f7cf756b4bee3b22a1434ae2311bd0e57974dca0c749c40e9095e
font_02_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 11016 bytes
SHA-256: 4a89af3604eb0256a65f8cd6cc01b1e943cb9d1fdf179d4732f756a8dafc8ddb

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