Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36e04bd9403e43c…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 11:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ec8c61ddb9cf6c7f04ea6ae20565ec8 SHA-1: c0d9f87f33e40fa6b539222be7d07b174cf1540b SHA-256: e36e04bd9403e43c8a00c5e91a0a170270a066996de23965a8ba17e936396413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS uploads, suggesting a phishing or redirection scheme. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving the exploitation of user trust through deceptive links, likely to deliver further malware or lead to fraudulent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=invasive+ductal+carcinoma+with+squamous+differentiation PDF link annotation
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ia4iobl48c4naqr5pbn1c1rtjd/41091687040.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/6228039236.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/kuraxizikef.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/41412083788.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/sunineda.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/32144936191.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/i8mlcjcsm53bdellpriddan806/91317565591.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc73cc1bea---35644825619.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839d9cde70---divisupozikiperatida.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7vrlo6749tgtar4i4cd0q9opc/gimupegolobe.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/87492369155.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9471d21af43fcd3dd67b0a643a2548de/fewenot.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160830daa829fb---82039720062.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7608f974ff31ff4db1875ae22d8258a3/97378946668.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73ef70eef---nerufanorigat.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f170b9cefae6993775ce763a14f57e4e/17474972479.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/88272a42705013dc4f3725f1a9d06f21/52121498760.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zurirupopezaniteg.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb6e77d65---vazubinesuxirasi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/380b14443f85377ea6d7b84d98340712/mulaterojunelu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084b05c34996---sinogil.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dbe30f49d26a31d22363cde7d433bf89/80803076536.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lemema.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90b2c90715---14041071531.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b6585bbe---tiwarulugonelemibifas.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 16960 bytes
SHA-256: a4a1ec7c58996b10f60ac4c8789f7b57367e69fce868bc7fb9e0cd360a7029ca
font_01_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001476e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476E 11088 bytes
SHA-256: 504d1909dc508a83c0aa5a0ae1bc9146396fa83fc2333e13648d73deaf6e1ed4

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