Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c46745cdca77fb…

MALICIOUS

PDF

102.1 KB Created: 2021-07-13 18:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0597540fe2cb41019b0a2600d88b375 SHA-1: 446ed272a35bbd9d3600556be1034970b77b3f19 SHA-256: 54c46745cdca77fb660fdd62d38f992cef6b801c8e6f5eca23e1a7b1306b1137
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary goal appears to be SEO manipulation or redirecting users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o62785of0m461jt7fkq078q5d4/tijinifuvazuj.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9a4406ed5cf71009d6df3344a4dc1a7d/10042000599.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1db25a48f---31471803381.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081032ca98a9---goparefudu.pdf
    • https://noddy.nu/images/file/fifuseru.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27fc61a4985e82128a58c4814d09217/38605290228.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/32089e747c7e4b2a66831290ef2a224b/kawoxifawuxupizuxoxe.pdf
    • https://grandhotelbulgaria.com/userfiles/file/25236717018.pdf
    • https://hkparkkonutlari.com/image/files/44615398268.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082393eb1b0a---kagavo.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828edf9b6d7---nipubalajuvijun.pdf
    • http://meta-min.com/files/63414766575.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a53cf5468e8---ruxubuzobakavexutewaboji.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7c438b3dd38df9831cd66e9196320d6e/50601665697.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/iujbse6f8vgkbq52138cg8ust1/7017818882.pdf
    • http://colorfusion.us/admin/images/file/23422119059.pdf
    • http://geoodwierty.pl/files/file/vixaminakufomujovos.pdf
    • http://qtjdb.com/UploadFile/2021/06/20/file/20210620_163208_120.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/59972438357.pdf
    • http://ahcxdq.com/uploads/file/091448262249.pdf
    • https://agatanorek.com/files/file/judodorekopilakitameliw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=exile+meaning+in+telugu
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001660b.bin
fa9651088981b7e189ee11504771144c2c3cf9dec8eca4a2ce1022c756b7cd4e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1660B 20332 bytes
font_00_sfnt_off0000e5c7.bin
d3e081dcccf2924a8a8db826edfc50f88e99953987f91f341de6e634f46402c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 10248 bytes
font_01_sfnt_off0000fcb7.bin
e91b87b3f8b7ad3648e53477092f67e36dbda53a29389559ea0acaee2155d9da
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 27556 bytes
font_02_sfnt_off00013db8.bin
14f0de74b4fd2e4b078ad08f2c5cd88700341f86252b3327bec0d7c58382e63b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 4352 bytes
font_03_sfnt_off00014dfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFA 16792 bytes