Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c61a37a80342e8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 05:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6d93df8a7271165a8f8afaf1483cef4 SHA-1: ea521d527536bc6ce7c82fc8f1abba047fe26d19 SHA-256: f3c61a37a80342e8ba69c5f79f566a262d61261070f5b04d91d2c8dbf5512fb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple disposable hosting sites, some of which are compromised WordPress uploads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a deceptive link farm, likely to distribute malware or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hflchw.com/upload/file/92411522744.pdf In PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/16185727132.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/juvojarebesojolex.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/gisenumukurek.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/kaxudupixu.pdfIn PDF document text
    • https://petribax.com/userfiles/file/bosifuvesazujulegumameris.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/pumalivizemegejapefebure.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/lufajakojuxozatalemifi.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gedopalipekafejopebu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jukogonenafariseko.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/lidudukaxaliwatumepuf.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/38660063388.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7a0ec6a547a0f0a9de8b4fe1585837d5/lenavolalowasunenemas.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/toxuwoxijetovabufafubixo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7c892816---72078816146.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/88046803468.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155c7cecde---bikizufipogaji.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/37758226111.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/96029776039.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/73837636423.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/93681884664.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/riretuzeremib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+x+downloadPDF 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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 20888 bytes
SHA-256: 7d3ec0ff02160dc59f78f3b275d81c17c6a0dcf00d763d0a560d70eb6afcc648
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 10232 bytes
SHA-256: 67f6a91d79f6baad293e88a5f64a1e184735e3f362d0fb3a1da5cdd15728a43b

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