Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c166327e83be6a2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 21:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50d4c4da19513befd79be9cf65edc626 SHA-1: 462a4094d233bea2d975848f36a50f437ba4d7f8 SHA-256: 7c166327e83be6a2fb7559bb8cb0f0fd8a591134f3bc17ba9de021c1e6fe241f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1245d6d24a3ce7bb0e76912fde2a1084/55997812165.pdf In PDF document text
    • https://marathonblainville.com/userfiles/files/kopozitaxanokejugegavikil.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/felanajubaluburinome.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/50317566956.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/dupulogebofisuwotetef.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160789f0b3123d---41719265863.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/94719078412.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/wefopilezevupikuga.pdfIn PDF document text
    • http://clarasonic.com/upload/file/vamutola.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/flku5dsd81vd0t2a7dpla1lv1t/vujavagagivewom.pdfIn PDF document text
    • http://goldia.cz/data/file/31234655749.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd583cc5b---34254909029.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0d169d9b770e805a09de2292302ef47a/26407623954.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vikonub.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgdqqm40qq5lbprd01ipu9d2o7/45403847131.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/99246479222.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98bc30cc5822282f4df92548d2958ef7/33478989520.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/6578346915.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/jotomirub.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59b997dd6---67073817146.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/4860752493.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdf081eac---besexevevujolumabuloru.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h7dtq5qta96bdm9h08m8nbkbf8/89926166262.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/kabazigiriju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=royal+mail+stamp+prices+2018+pdfPDF 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_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 11336 bytes
SHA-256: 84137ad605a669d8f59e4c2d8733ee73386799a69d7f334747bccfccc390df8a
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 17436 bytes
SHA-256: bdc04b2c7cb924c7e31ce0f78e530aeb39d46860dd5161c76220ab9ca54fbf2b
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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