Malicious PDF — malware analysis report

Static analysis result for SHA-256 4237f3847558ce49…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 04:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e86b0af109562c4a42588c50a36e540 SHA-1: 5a6d3d11bb0a09a84ce23ea36e0d844c59cc9584 SHA-256: 4237f3847558ce495a2fac8f03e0b8af44ecf4a4e7fca6a6bd341cedbf7a27f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates a malicious intent to leverage these links for nefarious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://dmscsmartlifeblog.com/userfiles/files/53213165645.pdf In PDF document text
    • https://gogift-it.com/userfiles/files/juxakin.pdfIn PDF document text
    • http://unseretochter.ch/images/file/98064678718.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/bojesavokidapusutuvojuga.pdfIn PDF document text
    • http://sakem.org/userfiles/files/tulov.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210717_064918.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/433f4cb4c7f316699f86f3d0bdce724c/69549374877.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/24138872066.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbcc4188ae---36287333111.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30e02bb3fe151425e0c1ca08a442daa7/naxefesitivituzomimoralu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/iusktps23r79nsgjcut3pd35qh/voledamevoketere.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/34050101303.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/5c51f461f635c38217e79d88daa18c48/waximawo.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/kozemovadidobemepi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/67vjfqb1r3n7l1pf39kftu9er1/bakeminobuxarekotokebuxo.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/26532134041.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/pemubukew.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zerenivakulejes.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g4c5a9q58jono2fejosdqjjca1/vujawuluvikib.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/buwijowavaduketera.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e505cbfd4---35900318293.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/83260715053.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0810d11bd---77616559181.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829b155f025---84641838308.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kinuzexilojarovizowofaket.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/dodejudiduwatasezuxopivav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manifestasi+klinis+stroke+hemoragik+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_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 11028 bytes
SHA-256: 2c5cbea2ce27710c604af101b1d5f00267112af836d3c091c4d79300103edcdc
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 17820 bytes
SHA-256: 585120474ee2a5c3e4071cc54d348a773242de4a0d2df007cb89d5b296a1162e
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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