Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a6959af919d412…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 13:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ad087f318d38fbde28670bf8c79c4b5 SHA-1: 9ca0f77f8aef29f88421e96c6165496ed26a608a SHA-256: f4a6959af919d412a7f16402f7a25bff4ae85eae75f832b9dcc90ff7632a89c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2e0a42973---53381704998.pdf In PDF document text
    • http://twtime.com/uploads/files/202108190744598676.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210828233143.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mobifenusubadisifu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/12244235525.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/texafiramaridotik.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161253daa92785---webigegolijeparu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73d11ccf5---15946635836.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c053d4014fe---79358403629.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450444ea15---rorifubavogid.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/13072014871.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/10796979644.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bbc62ddaa---fuselalarotafozifeza.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2e7b9cb5---tixapiko.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7h83p511ca1hnka7nrblu0u9l3/51643067568.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630002452.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/69565138149.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610c205d012fe---vamini.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/gulub.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tps6s6f58i4530eob8g4jbm137/66238647788.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xalejopogomupibiv.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/99432152498.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43140245482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+medical+office+policy+and+procedure+manual+templatePDF 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_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 16196 bytes
SHA-256: d03e6a659b323c778f12f737a3f50fef865ff91973fa0e441a583740a356dc62
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10804 bytes
SHA-256: 3d459119755e02724d3f4e071f74d6c0eeb718f1766787ea03f88e370f3cb717
font_02_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.