Malicious PDF — malware analysis report

Static analysis result for SHA-256 3568ba56872b1988…

MALICIOUS

PDF

140.5 KB Created: 2021-06-27 07:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c5e47a5b36a4152c7bdecedd5d0cb025 SHA-1: 8afa93214897885753e8b060cbf62100bd87f62f SHA-256: 3568ba56872b19883bcaea8458840eac023dc82ebe3c7e5c62319248693e7a35
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple external URIs and compromised CMS upload links strongly suggests an intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5717

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=love+is+a+funny+thing+jason+mraz PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160983d3e450f6---dewedid.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4bb87f7b---83408373272.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d54337a1f1d1f82e6fe207278f8241bb/54148774980.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gewovefamurot.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0ed5e60f---vebekevikabasijitekasanej.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/22067926112.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/72422282628.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/erqnu5uat7jskcv1arj2tt6fl5/galokefitejixexo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9bfa3183---jutewaw.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee8a51048---51532306907.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160896f72f2ca1---77993949126.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c8e07bc0b---31386572395.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gerugiketi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18b711335---topuvegerupeto.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608569c8d8bf2---86882043046.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/naniji.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/gaposigerisevevukisip.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/g9r2i81h83047pacj2v29pugu1/22243178003.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ec7ca62ed76d1ec16f7434c0c851559e/28602232113.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/41469211692.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b91dac7273788c38acf041622c9952ec/29965888159.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094688e3efd3---ratugefomigixulakim.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4b2b7cf6c8c43fc149baabcc63e9d675/8642595298.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/9433946921.pdfIn 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 11044 bytes
SHA-256: ec62fa948732a9330f8852d1e00ce44e7cf61c4893f1e0fc138f94abd2732908
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16176 bytes
SHA-256: 5427c50c4de5a6a3f21d45e0da4d80b43a8fb30860a0db119cec6bf4d9f91ed9