Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd68f1f3d4f2557…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 02:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e0ad337aade9b8af6906c18892f4df4 SHA-1: 2775664ea7c588005100771ce79cbcaba3785ce0 SHA-256: fbd68f1f3d4f2557aa59ff20cef7dab9e5ac102175a86775d42b0ed59084a296
124 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and the nature of the URLs suggest it is used to distribute phishing lures or second-stage malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=social+dimensions+of+health+pdf PDF link annotation
    • https://monyetmesum.com/contents//files/65995175695.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6baff22f3639387ada9a89ed5435c69a/36199034684.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f4e27a8e09b990f584c25237e53f6fa3/nokajavilekotu.pdfIn PDF document text
    • https://renetravel.ro/images/files/43909506563.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/lupileku.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/28009174308.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/56675731869.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/donudufazugevarapulikasos.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/957795c2e09c4924ef4a948e7cec8cb7/xaxawajenelunixeb.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/88235718238.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/mafegow.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745eabd447d---zifeliwigorosexad.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jurunilinogad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6b3765e6e---50989413169.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/mufufubimedelofe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61e09ee719---bikuxaw.pdfIn PDF document text
    • https://soechi.com/userfiles/file/dawefotol.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0936b4be8---72035144496.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/86427629196.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c4cdc8e---88739455594.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/91161943403.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf38a074---bejapivewixawejasamomu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acede6772b---ponedafozipojurevudu.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/puzudipezukexulok.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17416 bytes
SHA-256: ddedd14b6732613e946f14fe732a630e0aec8c71f5fba2e7fd6eb18b08fa320f
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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