Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae269c0b2803289…

MALICIOUS

PDF

95.6 KB Created: 2021-07-06 03:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d081dd7530251a68a2d12bb538f8fa23 SHA-1: f0aadccf4a0a8ed7594ce9c4dd018f635d099969 SHA-256: 5ae269c0b2803289d2677e3d6336094910681fc561ceba698c82375630d3a40b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://ketchas.ru/uplcv?utm_term=reading+class+in+spanish
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakojozavad.pdf
    • http://omak1968.com/clients/71178/File/34687486785.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/88c6v0sp16rh1jglt2kuif5dc2/14301431371.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4nhm2d6nobhvr0qepran7ms397/luganivog.pdf
    • http://alexhofford.com/temp/files/file/78127290596.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fcd6c1e5---wadapuroni.pdf
    • http://softwarefactory.nl/images/file/tubinexi.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/16757696673.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7701bcd7bb207c2b74ad026834725ec5/58661836922.pdf
    • https://circolodelpistone.ch/userfiles/file/20177527738.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867049593bb---79160494952.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210619_214822.pdf
    • https://rajaunited.com/contents//files/34564635880.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lth208rnm5rra6sg7jfjcrj5ki/vowofu.pdf
    • http://www.euro-fly.eu/userfiles/files/7707623625.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4sueqm7i80flea5mv71l0dud6/71814217080.pdf
    • http://romanakladatelstvi.cz/userfiles/file/bunixul.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6ec92fb23331cabe8150818d4ae93108/silusadexosesufakak.pdf
    • http://studiotecnicomancini.eu/userfiles/files/rafuvuwemak.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e7b769aaca8b73016a043ebc034d80b9/safifix.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4f6b5702ed92f3958ffab85e60d85351/venetawuver.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ed1ae5df6678cfccd9a7fc2d980139e9/ziduravulaxenip.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p4lh1upjvrbujkh1jc28sjudea/xinovejunenonevadebis.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/13251839152.pdf
    • http://allaboutdowney.com/userimages/22901923918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
font_01_sfnt_off000115b0.bin
6354d5b96b11a4a1d6ccdf0872953d47027a3f960e780e35d4937b048033b43f
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 10520 bytes
font_02_sfnt_off00012d3e.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16312 bytes
font_03_sfnt_off00014345.bin
73918bc74e85f2f6464d69922dd9a9f274498d94dc871f3515168d146e581084
pdf-font-stream PDF embedded font (sfnt) at offset 0x14345 17712 bytes