Malicious PDF — malware analysis report

Static analysis result for SHA-256 5424766aff003da2…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 07:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8ce4ac642a360ef05d32bef0f87e46dd SHA-1: 4ad1f31156a28764b657e1635f4fd79d99b4e155 SHA-256: 5424766aff003da292ff53976fa952fb973e328930b9aa898dfcf0469e35da9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8ad9e004---77118368775.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/samosip.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gutedop.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f97958f87da5b2c255235304f5c91189/nalovap.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c96205ed143---73751389976.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/64981846557.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb995f37b6---95393937706.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/79015533021.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/94225541720.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c75bb0dbb2f---devatated.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/623d129786d30690b0d6ee5422a7ea9b/51746435545.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/zogevoxadarolujatizubo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b7l9oo9l2e4t67g2vt5rc0g99m/14157788183.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/33ragivu1kn1cpv4vs2j5hjp70/tofudabobebekafur.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/komimomekitavuruwisu.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wularodidadikojavowago.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1c7b300a3900ae857604115fd2a6f20b/resomugiteludetoton.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608042db6ac42---64859147841.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/glusaepp0givg0ol2jnudnivsk/3119148842.pdfIn PDF document text
    • http://alkanboya.com/files/file///93927171955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=examples+of+trojan+horse+malwarePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 16692 bytes
SHA-256: 36c16ad72ee83bbbe8cd64e089d4cb5bc8d0e78410b79fef4999b2e38ed3c617
font_01_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 10832 bytes
SHA-256: b11771b5ade929a0f0724e378f135b87abe1ed5eabc7ddd8f544766d66764291
font_02_sfnt_off00014070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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