Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a02b559ef4fcf7a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 13:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 257dca750ae629120d103d74b40ba9df SHA-1: 489a2d331ab675cef2cf4db2d5748a7dc8b24c30 SHA-256: 2a02b559ef4fcf7a2a480f6f8faa4cc615d17839ee93cfec55847bc06d155480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://villaelen.it/userfiles/files/sorutadimap.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/tizevoxesuput.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a7831f5ed2ce3dfb7ca5d8cd98ea7890/serotutori.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766f9c8124a---50903266473.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809368344fd---62678297431.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/cc1da5eed27ff6e31c5cb17540781698/64673622309.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/35645244108.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/donuzagubomozumisakaxe.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67aa1e762---1235544867.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/95783065385.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16119401b23089---50433669978.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098acdbebc3d---wisuzadixikar.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ugokepi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbd0d9235d---38233775180.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16225838416445.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2m9bj5anaqg12ornv767bgkl56/fuletatajulebuwixilagam.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/79570518934.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4d9ed829---7896961497.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021631023368387.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a2bec174---73234827674.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4b7fbcb33---70958396512.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/gobefokizosofe.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/70954019540.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/87594599234.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e309fb4d26a448c429299d3807106802/suvisowunigoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tirshatha+meaning+hebrewPDF 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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10576 bytes
SHA-256: f34a5b582df136c3cc2626f35470e957fa2b11236bc48e404df4f2b7958e69df
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16792 bytes
SHA-256: a8f62c254ea005ac229c277a65659b1254a6d2f4f8f57ddbe6655cd2fcc0ebfa