Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb876c0ece9f3d5e…

MALICIOUS

PDF

96.9 KB Created: 2021-09-06 06:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4799c87d8e792d1b0199ca46a2205288 SHA-1: 934a683e3b04c1e994bc94488c19f74917dd5793 SHA-256: bb876c0ece9f3d5e21ba2ba942e3f4a3a20b28e1b34a0c2cd226a700cee8f1f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. The use of link farms on potentially compromised infrastructure suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48698bf9d---rekodew.pdf In PDF document text
    • http://krallarintavugu.com/upload/file/29881149347.pdfIn PDF document text
    • http://strandedtattoo.net/file/52213632440.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/74346359826.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/jexepomori.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/2649807960.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210608_121912.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/eabc4c3029e20e49c32a9970e9c1b065/63590351246.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/2638800675.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079940d3f2d0---womudizasivegojozu.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/88389676384.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1429f2431e00d26509e2babc0fbf2978/29124387081.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a95e6bbf3b---godubaganadode.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b195ecdec50---babewujoxu.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/46489778716.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608022579b0fe---kibewukomawe.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/92171565088.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9d2828ea---23871807704.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/wegemoruxokesiwuro.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/5df91f893ed047d5e34dcf8acaafed42/17015086058.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/nesusupebapo.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/87491529307.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/77ded5j60g8sjdn39g309lbdji/20136622482.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612922ac685ff---danevegepelazufafi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/bafifojikijusegonagodidiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=reconstructing+amelia+pdf+free+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_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 11196 bytes
SHA-256: daa40820b14840167cfd65b380ecc4c772f4e8608c195e3abc9877305a6e31e3
font_01_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 18800 bytes
SHA-256: 999071760199e692f9d44153a5c687250d7377561e31a1f46d9ee7e8c9333045