Malicious PDF — malware analysis report

Static analysis result for SHA-256 37af326802658254…

MALICIOUS

PDF

90.8 KB Created: 2021-07-28 07:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcc4c5214dc65037d19613b85182c116 SHA-1: 71faf5ad3fe7e7714fa7131e8b4eb79d6c7b670f SHA-256: 37af326802658254ea9c9a95db3379f8d7f39a156caaaa5da144deb78cf03e05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/89resgcp0mo6t6j3qqk5k9vqfg/62359819511.pdf
    • http://rosesrealtyhomes.com/userfiles/files/93385956904.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893994d08b9---35392566175.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d1f92c81eef19fddb18d9095184a5a05/60743425611.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c22b959e6---gubefusamebewevek.pdf
    • http://musiclivemarsala.com/userfiles/files/verib.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210603_DA5727F851EDA079.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8rsr9feiblm7l1rd7lvi9k5k7o/dulava.pdf
    • http://studiolegaletrotta.eu/userfiles/files/lajizusimerejumivugeto.pdf
    • https://sanaspinler.com/calisma2/files/uploads/vewapebufugiziwoj.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/kimamu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff1499359---poruvinizuboxepu.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2befbf119b7d0a0c284c2625e672015b/deferorojupuvani.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8c2a84e61a9390ec3b9de0265812020a/91143858704.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0510cc90f---28213572382.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcd435fb2---70409208318.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1a85c5e0---25999488495.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f3c32619---97557968089.pdf
    • http://maility.pl_adresuserfiles/file/19891108829.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/q0vs0t5ec9vnrfhe2en4futbev/pazonewatozanilajenatibe.pdf
    • http://originalcheck.it/public/img_admin/file///dinapelekofigotolag.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1ei6db419p8drsa9pgv1brvvl5/zamigewubedawesenope.pdf
    • https://transport-vehicules.fr/userfiles/file/lokivale.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=easy+spanish+phrase+book+new+edition+pdf
    • 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_off0000fd41.bin
516011c631e60f6abfbde1cf2d7cc5e03050f9cdc2bdd813f329020e72030255
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 10964 bytes
font_01_sfnt_off00011686.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 16792 bytes
font_02_sfnt_off00012e98.bin
b0c662a65c8e88204f7bc064f36a0bfa1c7a33ab518b1d8eeb832622af99d001
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 17616 bytes