Malicious PDF — malware analysis report

Static analysis result for SHA-256 700a6ad8e3c4beb9…

MALICIOUS

PDF

101.1 KB Created: 2021-08-23 10:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0af2e9e21a341dae326cb5f31ba3f816 SHA-1: 10c10429bdbe63c7583b02d5e131594a46ca13c4 SHA-256: 700a6ad8e3c4beb9a41921ce0aae0062ceb203939298ba99b09ae3b163f9e747
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://reicar.dk/userfiles/file/vupinukilupo.pdf
    • http://krajinar.cz/soubory/files/83509318922.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bae5144dc35---fozuxojizuxelejafefo.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/33787038900.pdf
    • https://gsacademy.ge/uploads/files/gojolinejatojovafozefam.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7d548c7d6ae70b2db5683d883812ad41/buzoribexoloxekipapafa.pdf
    • https://villatoscana-pi.it/userfiles/file/lipegedogifudur.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/94657801848.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a418d426d---jojoma.pdf
    • https://cowik.pl/upload/jotofekusaloti.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lebizamuzapa.pdf
    • https://www.xyoaa.org/sites/default/files/files/99293678963.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4727ebbf19---28574503396.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4efd1a4ecf---65729344709.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/72006229657.pdf
    • https://laptopserwis.com/app/webroot/media/files/vawuduxajovo.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d628be44bce---37878216828.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be0109337df---ropadogizujuzowuve.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5ade0f00b---31927985384.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3f93dfe4fbb0857624523a8d2b946d75/62505731180.pdf
    • http://tbff-bygg.se/img/files/luwiwomome.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076500394efd---voboxoberumozi.pdf
    • http://jyjjapan.jp/files/ckeditor/files/jupupitopumubivodisezi.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/72368c4e73cdd8cabefd3255a51192f4/wijegop.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/903f99797bb1bd092669bf846f1ff0f9/53341834423.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=one+syllable+words+that+start+with+c
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 16792 bytes
font_01_sfnt_off0001364d.bin
273bb9bf5fa7dc68449fd910b59f2ee6655984b33639b31c3dfb865144e8a877
pdf-font-stream PDF embedded font (sfnt) at offset 0x1364D 20464 bytes
font_02_sfnt_off00016d4c.bin
a40e7ed658c9eb89374323e7fc9ee16763680c6a3cea4757ac0b948c2503a523
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D4C 10832 bytes