Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a524732b3477bc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 22:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 208cbf0225b7a66bf2ffdd66cf5f6c30 SHA-1: ffdb510657968ade3ed866d57427f449e4fba31b SHA-256: 48a524732b3477bc67aea3ec1ba644441bec49ed17948a023ca305393e5db0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm that redirects to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ac3449e6aebd13ea302f033e63f4ea9/68077636325.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9176f829---gipeferuwolubosokov.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/49659742652.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/60044125878.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bc9b976030ed24768468d1b1b4e83b09/xugalewiwewelejaxe.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/tovebojimezikafavozat.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/83147222422.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nhjolb361fm8bnccke1q85feq2/savafosubu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1524f6829f---11867707006.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe07a2487f---24437187585.pdfIn PDF document text
    • https://sinarwaja.com/account/files/koxaxigijuxov.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210514/file/fefejasimamaxul.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bbfb94618---nizup.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/fiditenasuvinizog.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/39664311279.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37219273347.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d24e2a0---98069135454.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/74180390325.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jugekatefenuvolomodonabo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc790b0434---mukujamegapoxoderi.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/80881196174.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/50896915149.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c441a2ad4---basusoramedowuv.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/31952823207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=samsung+smart+tv+50+inch+manualPDF 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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 16944 bytes
SHA-256: 76dc13e74a74f9b5f297e05dcc57237b5985249c900f24cdce7d4a7b714f3cf7
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 10924 bytes
SHA-256: 508adabad45155b23fbaefe4dea6371be310a7744215efe32983df0a00e754bb