Malicious PDF — malware analysis report

Static analysis result for SHA-256 b788b3536cfc893f…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 21:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec5f820fa5c9df5592ea8b4849f75a38 SHA-1: 6cd5386cb0f3659c90db8139ce6d2a751808767f SHA-256: b788b3536cfc893f99964d66c60b3fbdb4a0cf32acc6b23052d1f088c510b0a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links align with common tactics for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=municipality+of+agusan+del+norte PDF link annotation
    • http://seasonmediagroup.com/pic/file/54582909099.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d070cd322ceaaa43e43472e679a005d8/87068544621.pdfIn PDF document text
    • http://wohntraumgmbh.at/12819171400.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb0bebe03---xabaf.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/960141579.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/57369957858.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/mipama.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tuwibevozuwijoxilofi.pdfIn PDF document text
    • https://filetorme.com/upload/files/vegezaregudikoxufig.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/botubeka.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wifukojukiju.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/dogipixolag.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/fifebefivujise.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17496150312.pdfIn PDF document text
    • https://highrise.pl/file/4099498803.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/lodazaginoj.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/63397016218.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/zuwukizi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0f520f0e---kujitutaso.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88234871035.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa16177d37---tepebefevukubupizividajop.pdfIn PDF document text
    • https://hssanesteban.cl/files/98937694067.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-11/20210911082355622742.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210915_24124524F38DE403.pdfIn PDF document text
    • 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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 11000 bytes
SHA-256: e5d00f3d618b464c1df82e6e7bb092dcb8e845392b832d7933a67d115fb00c8f
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 20536 bytes
SHA-256: 76512ac1e8ee49b0c841caada92c4e85c38e0a011a2842827fc7fbb4ff1decdb
font_02_sfnt_off000144c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1