Malicious PDF — malware analysis report

Static analysis result for SHA-256 754e96ef77a1ac1a…

MALICIOUS

PDF

84.2 KB Created: 2021-07-13 01:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c9893b3ac92d207d56700c595f109e8 SHA-1: cf4ab1a9eeb538d04544054638d9e8aa76459814 SHA-256: 754e96ef77a1ac1a246b1b58cffbffb13512dd7d983b66ea62f346e2bb473baa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/80fb63a699d835ecf9ffe96b6adb3872/74495881381.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c04ded798---fazejajilikusededeko.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/91a0a0d5761b01f62e94355b434a0524/likegivukikawirawola.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/721c5e7da794a2de7d1cca965f68246f/32247750033.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/35163846755.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5e98121eace0605bc91eff58d905787b/55470931180.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kadad.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a78083920---sarufewevojaloro.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/tukobowiwezigemu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lufiradarakinimab.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/29982721428.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3736df8632172c5cc4d3cf8f24a5d5a5/61036314967.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d43e464a7e---rebepirejebedenovonuzof.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a071fd37622---tofozuf.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n1dc09tubv3s3iagemufd7uhl4/badodov.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6f539da7a84167bbf820b45eeb72033c/zejifibu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f848eedde1---65653970126.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bebcf04dfe4---nimupanedeviv.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/balusexav.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb08fd1b90e---rusobokezurijeranejeli.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075822143132---16989141152.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-13/20210713053149473731.pdfIn PDF document text
    • http://fygl.net/uploads/file/10005850541.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/vetofiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+purple+mixed+with+yellow+makePDF 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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 11040 bytes
SHA-256: e6f0d9c0270de44a3344954fa23be8710a78a5711c3000cacc51c4f8e71429e3
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 16228 bytes
SHA-256: 6fd00afc2ca996c7533e62159e92e234dfde3b47dccba8eb3a386ed960166c39
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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