Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c5e3dd8baa0f84…

MALICIOUS

PDF

75.4 KB Created: 2021-07-18 06:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a81cc82b2f785da15cf2b03e2bec76b SHA-1: ff7310f9dbf05dfe3f857756b793872f6e7be7c4 SHA-256: 46c5e3dd8baa0f84a8cd956d3acef45c78486d48d476bf183dd137b11c50fba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4cb68693b---62743608477.pdf In PDF document text
    • http://servmed.net/userfiles/file/dofifotodufutatov.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/48741976275.pdfIn PDF document text
    • https://mahae.hu/files/files/35549510861.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/merukevokelo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/sakajubuxelo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a902b0011a3---datavopijukadeginurilul.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/mavafubexuvubirixubiza.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a3ba0d8fe2b89c89719a91b408fceacd/dopido.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vojejo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21ed8a241---kamisireba.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/rilunanesu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfc4270be366a1bf8107c8f9d45d2eae/jototiruxukaledeza.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/564918744f4e2b260272ec2244ea4f75/96773804346.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9l43r9ocho7nfik1fk7qak4471/jewixawenif.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/890d46299099fdb56c3a6689a681c24e/deralu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/85447697172.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d026a17470---fexezusesijafuwopizu.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/48707602689.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/46182050775.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/digazi.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/1542174140.pdfIn PDF document text
    • http://www.asslar.de/downloads/xidofozifexum.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd5ee103e250cf4a018abf9f62b265a7/jelusunipumaruve.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb4ab3bf1d---timadopevinomotene.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/29562682495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2006+ford+taurus+owners+manual+pdfPDF 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_off0000c362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 16416 bytes
SHA-256: 2c66c01c86a76ed88e08ffc08c7ca23f9615c3ffac6b7c0d4149195f4acbc24d
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 11064 bytes
SHA-256: a28458dd749c8d0456f5ac057389f0956692240477f886efe3a28cc3d5f8021e