Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f33e636999dee6…

MALICIOUS

PDF

76.1 KB Created: 2021-06-28 06:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ec4f8c57c0d260074ade8ba47649aba SHA-1: 45b29297dc21d08c5e9ec18383f26492a3f28f34 SHA-256: c5f33e636999dee646e7f680d38c43710618339077f3b095add76e091f21ee8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8be5627f---pojesop.pdf
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/podimexipudowos.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1d8e13f075b6386fc32fbcf74a02d8f7/18211225087.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b1f65e96---82369668054.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c1cabe81237af3eddd6884cc31c2b595/94448854928.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/nunagikej.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xexeboxe.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f3f4f074f13240018d978e5c7dd00053/volarulivujaredavivadogos.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qv8h2dgiua0bfoh9vsiscvqbpb/kapepagozetipolizifuzuk.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a516587a1f5---tivuzabenewiruzusi.pdf
    • http://boathousebrokerage.com/userfiles/file/48155422884.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf7392184---32834823191.pdf
    • http://www.look4job.gr/images/_user_na/file/mamezipor.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588ec5bc80---10644053635.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e851366d3f---jaberafokuvilo.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7372c1c50b603dc8e82d1f9769201b5d/21001074735.pdf
    • https://bouveau-consulting.com/userfiles/file/supisudekafigoz.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bcbc9522bca2dca3bc48421ca359f09/lubigenubamazef.pdf
    • http://koryosushi.com/uploads/files/basid.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4a217c95346031ae401ed244a275ac14/xuxudafogoluj.pdf
    • http://studiogallerani.it/userfiles/files/61042008868.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ae45a0f3e8d3f3acc7a4e2eb94e95036/60843596698.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=5000+brazilian+real+to+usd
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c808.bin
1af23d563284186587960e9b97fc073c06eb2d1ecedb3a24f872a4e1e4cb563c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 10700 bytes
font_01_sfnt_off0000e0bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 16792 bytes
font_02_sfnt_off0000f8cd.bin
09e6b9f4f00188f1bf449e5f41affe5eb8934e5d3ea6211df1ab9885329a18fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 16384 bytes