Malicious PDF — malware analysis report

Static analysis result for SHA-256 1372880390557f3c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 02:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc12f082624ac9bf113ac9de36462c69 SHA-1: 5b576d0392c4011666883479abe74dd436eab1d5 SHA-256: 1372880390557f3c68570a5cc638122048c9390bc866ab0a8f55c499b6509d72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/aneularrciqr69rb1ppkk77hj1/80022548965.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/60077237510.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8600d826e---nojemakomuwokajagepovapam.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/sozavogibapamazozi.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/eqvmredocs2bg6l71m73a4hgc7/29976800835.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b156ab4c29---55890891716.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611192ee2716c---13623039911.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/sikoxigowugiwejufod.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/dnnsmsgr092kdqgvfr3f3fn39e/79937606062.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/357221064.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cc49677573775df8300c9795cc28ecfb/5496937810.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/joradogojepuxiginotumu.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/xofewa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6516a9bc5---35957736094.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/koguwurozimikuxu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7f748266e57fc27dd36d7c925135e530/zaketoripajeb.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/95264234733.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/71426146069.pdfIn PDF document text
    • https://medtek.vn/storage/file/49052655268.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f101167724414f2424565122cd331528/fudefaxekifovixexox.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/46553757383.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tajotudefapudejagozi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zufedunezopogawu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d481e1b0---80264450047.pdfIn PDF document text
    • https://geniodelweb.com/file/wesomor.pdfIn PDF document text
    • http://gzhs168.com//uploadfile/files/95136867386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=courtney+cox+then+and+nowPDF 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_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 17672 bytes
SHA-256: 9efca98737771ae1ca3134b4fcd79fd240504010956a2d55ad75506dcddb5497
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 10596 bytes
SHA-256: 931f115470fb0954e6a474295cfbac742c0316d325d89ff5e42ff51198283192

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