Malicious PDF — malware analysis report

Static analysis result for SHA-256 313b39cf5edc7ceb…

MALICIOUS

PDF

87.9 KB Created: 2021-08-21 13:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d77fd6ac2c52956467ccb7756e4d1fe SHA-1: ab3a0ff93456f7e6b7259c66b91485aae5a177bc SHA-256: 313b39cf5edc7ceb8ea7ad5bb80c75c7f7125f53f4fe12aec346b0b23f995e2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=how+to+smudge+with+palo+santo PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098931a69b5d---konowopujuzidav.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/69ekfls19td81ppaj21jkghmfv/ziruzapixekiwetofid.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d39c5701bd---53715270723.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/22d4c7f443f82a18e920460de9cc0e9d/kemelulijojuxedaxagug.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/kiziz.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/63523762686.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a89383b6f8d595d26155a2f53a3f259e/tutirubemonanajigiru.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p1r15mckten60fp44suoqfr0l4/3023467772.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/489ebb9aa5461a7f355e7ee629dbe4a1/rawawuzulabivok.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf341663d---28658833394.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210603233008.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/59638788168.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/10596876580.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/2017371300.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/58d96ce4a97370bccf4d249af52da627/73309215744.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/ridojolewesulibexiz.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/bapabuvuburul.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/26622742939.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/738257122608a91b46b75c453a2b8f67/suvozigesoxaluxar.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xisaj.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97f2ecdce59889add055441066ca961c/43146015799.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b625e65d---tagoguzeke.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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 10916 bytes
SHA-256: 92a3ae55eff9fe32c117af2df5fff820543d68476ddfc54224baeb58955a1412
font_01_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 17548 bytes
SHA-256: 41892d8bbbaf3ea07896276c3e1c1e2e81a7b6f72310f139959620de892bb911

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