Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4156db3526813e…

MALICIOUS

PDF

119.0 KB Created: 2021-07-01 22:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f216b918a33ed39d47eb7fe35fef4d1 SHA-1: c4e90d9a5284b6f17c6db3351656fc28886af6d6 SHA-256: fe4156db3526813eae7e95b1d44edb5a3a43f5b733b8b4a0c4d49ce6a0005848
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets point to a malicious document designed to lure users to compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://habibitours.net/ckfinder/userfiles/files/76851266765.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6c7bb90c282e7bf37b94a154c615cbbe/gunoginefepotuvozobalev.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b1053c61---53721623210.pdf
    • http://hylevel.net/Uploadfiles/files/mujimolozipukibubafuza.pdf
    • http://yasairamenbar.com/uploads/files/nifer.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910bc49d475---74010906420.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/59034384500.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ea6b06314d07d1ffe584ef0d691d9361/betibasajanimipisiji.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6skpatdagmrou3jvfufjdh6ad9/gimidewewutaxosujewul.pdf
    • http://rajskiewakacje.pl/userfiles/file/zadugusaxotudunajefoje.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/41242375735e2563c42e35f9e14b98f2/84186615032.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ec3edf620---72711169640.pdf
    • https://arte-salon.ru/upload_picture/zatidovonivakewejewilisuk.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/22c3158860f776a8e6de075ed03473fa/50849637224.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/votugu.pdf
    • http://curry-box-deluxe.de/userfiles/file/71268549056.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9cf01350dfc109572757f71ccf9b7877/misejem.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28f6644c5e---bigakonifizuzoxama.pdf
    • http://handbook.hu/upload/page/file/mekiwejubiwa.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa824acc633---95501946775.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hutb6idlkkf413ja7ltpk4rovt/visonof.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/79772914988.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430030804606542.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gk+quiz+on+tigers+with+answers
    • 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_off00015985.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15985 16792 bytes
font_01_sfnt_off00017196.bin
6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x17196 16064 bytes
font_02_sfnt_off000186a7.bin
851c1120efb21ac1320deb13892d3765d877d9010005e62ded482fd46bf53089
pdf-font-stream PDF embedded font (sfnt) at offset 0x186A7 10864 bytes
font_03_sfnt_off00019f8d.bin
accdc121fadc5e4e5ee25691754e0d6d488c04c08e2ad1e58788a1455e4fb7f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F8D 18024 bytes