Malicious PDF — malware analysis report

Static analysis result for SHA-256 847e6fd45949ab47…

MALICIOUS

PDF

157.2 KB Created: 2021-06-30 00:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ac95f9b4be444ee7f075c3bdbb8f8354 SHA-1: 31273726fedd40c2c72c56cd6cba63547e382118 SHA-256: 847e6fd45949ab47bc255de6b0acda548e51c9b5ba0ad70a2e71bf38057a90a5
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=neighbours+10th+june+2020 PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9440a11dc3e0bd913e0b9bb9ed8db20f/41808994566.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/90750609847.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2hrtm4297u5k0fcqklpv3blcvp/sunesoligowutaza.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/79753874441.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b4ca4gmcm1k1b9s3ig2js9msgc/tokuwagolinew.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/nilujokavemalefage.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/vikiwinitodosutijunope.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3203455a65---jotelidataronevumatuxe.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4f7d01b3---7400301095.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/tesixawetiwirupe.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ad712fb8---kebunifejogarofaxif.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/06chos8j1rt0vjv5qc9alec75u/favewibatos.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/pmbjpci68onb16i6cv1i6g13g0/kefamomiginaxe.pdfIn PDF document text
    • https://areicon.com/images/file/99417680682.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8a3cd5454b7762f04b692b5cdbe33481/1575532373.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050049534386.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cfe7e4200---vososun.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/728cc246c16bb67a894863e2e93461f6/25854891635.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaed71d627---41356309264.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2b4af9f5---65073980359.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lakujur.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/fitifuworef.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/27476564320.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37418b2487---zajapapatosuveveruxolavu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pevitigusutajekuvimefokok.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_off00020742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20742 17832 bytes
SHA-256: ba59169964ad3cc3877a1499d2327ae6292bf7b6d273bdd73a96293ea70fa475
font_01_sfnt_off00023613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23613 10820 bytes
SHA-256: 478cab6f2f98b29aa0d1d0c651da0579b1f0280813f16fda5aa5be947e78b32a
font_02_sfnt_off00024f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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