Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d81c4d86ef2de…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 14:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4c059f6541e52439455081a217cea02 SHA-1: 050ea9878e92891ca5fde8425a1315ee3b34b40b SHA-256: dc3d81c4d86ef2de28ec351afbecca5895e34e58f8952ec37f3053c226f244e3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are designed to appear as PDF files, likely serving as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=subsurf+hack+mod+apk PDF link annotation
    • http://trevelsi.ru/ckfinder/userfiles/files/77003645760.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/rasaxetubodovaxagezasezo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcf19466---94578328102.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/xazutota.pdfIn PDF document text
    • http://3sdent.com/upload/files/rilunakosan.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/25011805683.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/nupimijuzezakujupimijaw.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/59029880931.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/17785350975.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6ju4sfkn6tgllpuhdgrgoeead1/1953514292.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/tarofabodefelomudoxeno.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210910_0A0805432304D8C2.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/mamuwuxidumegugem.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9366b491---mekexaligovukopenorubone.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/15406034807.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7eb00a8b8301fe5977a113f6aa7ed395/70123378425.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/65852923183.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/devarelomakowu.pdfIn PDF document text
    • http://melvin.cz/data/konabad.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5d3c7602---529741985.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/396419695.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b7319f7e2c768aa29ac126f0a89832ca/89457359426.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/daded.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/70188165993.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/82675484656.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 17140 bytes
SHA-256: f0f8c2dcc2f60357c39fb861ee9cf0315362a5df50000438d018c952cf785121
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10820 bytes
SHA-256: 8951093b2b774dfec762d0cbcdc97cc6a2aa0f1ab8b428e06f000fbde3c51545
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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