Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bf12f4cb1cb4dc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 04:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7447bfed7d297a6594db1d7c545d5f79 SHA-1: 4e1358a25a05b57ae7871af6dc1cbd6d81658abf SHA-256: c4bf12f4cb1cb4dcf80c6a943b53b80f7398dd0028ecf716e3b697339e735862
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The embedded JavaScript likely facilitates the redirection or obfuscates the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://coiffurenais.com/userfiles/file/gokonevuf.pdf In PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rasupezajupomesojukifa.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/tixulatuwiloresopamesexat.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b03a2672---90909194638.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/viwiresitipiximogig.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/zobedizuxixi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kojuxofasiwexudapenoxa.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/767159858.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/72305562273.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/23509199075.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/56628282471.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/bigavomalutez.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wosaj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d44690f3---36436991448.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/niwaloxirojok.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9e6526d6ba4e013d09164325f2bb4b98/64810147504.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/josudukinabobasolixe.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/40831003492.pdfIn PDF document text
    • http://partnercable.com/files/73126030213.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/misogojamanaverox.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e483372873---paruniwug.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/40435987257.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/zosegesejitexut.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/55520889262.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b669135258---1791482052.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/bapenajogavukenifune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ios+software+androidPDF 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_off0000c1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BE 10340 bytes
SHA-256: e1e6e6c8fdba79ff27e6548a8c9129660eaaeb102d7c0fd5d889a3ab64500128
font_01_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 17248 bytes
SHA-256: 8a9befcb1dae6b6cdc5221c81b8294baf861605da0df274f19eea50e26459184
font_02_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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