Malicious PDF — malware analysis report

Static analysis result for SHA-256 76909b3cf495d735…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 02:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5369fffbd6d3c9012548e00995a3e005 SHA-1: 5dbc0f987ff3283a6c910dd11c61d3981e2410aa SHA-256: 76909b3cf495d73558efcb0534a61ce9186f921718373c86cc77f1adcbe17dad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=metformina+y+baja+de+peso+pdf PDF link annotation
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/ximelabozobepesigude.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/42696133580.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ve9pa1j8kiotn8v010tmk3jrpd/wamezojite.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/130b4b20dbf583125a2cc2409b7134d1/52707128390.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd70e271e3---20033807024.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1c91e0cbe90b2c1067d3e293263d404d/80808232378.pdfIn PDF document text
    • http://shesob.com/file/files/rapebusebolopofurevu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e228da4a---44453405014.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e61306n22j0fbh396m7f3kasv1/dawimomogo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b4lsg0394f05evq11n04vl85pr/tigexiropu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/25816969108.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/suzevix.pdfIn PDF document text
    • https://btegypt.comfile/76109882481.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/towopadokof.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16103099adf54f---kuzemimixisoviragituxugaf.pdfIn PDF document text
    • http://indel.sk/userfiles/file/vazatuxapepiraxoleribosi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/d48agggmdj668psfu7r626c0d0/27639652535.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4fd19ccfcfd804357db03c47fd7290b2/79577338085.pdfIn PDF document text
    • https://magatek.com/documents/file/16210643302.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/zebujelixakojudumi.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/74362105650.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/33806830182.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/pimitawebatoxekixir.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/79468251804.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/niforasomefixuvavibef.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/91543273115.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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 19516 bytes
SHA-256: d84cfa9097487363a09099e0f35b2f65c30279c4e075189bfb1a42095346f167
font_01_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 10992 bytes
SHA-256: fab255ee61145a6d03c7a3af1cc36bfe1b43c196672328be3b9567c2b4efe77c

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