Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1d1e0f43aff89f…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 13:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98f73b9905a6beecff9d4e31542567bf SHA-1: 447b45539e4ee4f91652b53deb81c3feb8bcb7ba SHA-256: ef1d1e0f43aff89fe6abad31594bc3af7c3860767b519c8f27fa0c904011823f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were extracted, the presence of numerous links to potentially malicious content suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78df328e9---detozuliwatataxofupolesi.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/81146830904.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8b19f03bc032254b2d264967808de598/zufipegemaruranowemaromi.pdf
    • http://ylgems.com/file_media/file_image/file/lefusurelajokejir.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8kk23qn901jfors414nngbc0h/3285642013.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608083990ceb6---kebalog.pdf
    • http://finproekt-msk.ru/userfiles/file/riwivutopinopizutazan.pdf
    • http://ladyvenus.it/userfiles/files/jamatekazizuludidizu.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0d43b2984---dipozamobasamokidagitu.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70f5a1d44f97fb62e781f141d4554f9b/manuto.pdf
    • http://sztarmedia.hu/_user/file/teziminagamu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9735437---7706139509.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/93e8f4c7ca1440d3053578c14fde48ab/38293239401.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/28030754404.pdf
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/33257005701.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528220656.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9melh32r9o99h97jdmhinqc3o2/51182026531.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f825fc93e3---75004214123.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/18mgj1qvibkbq50pg4kl4io44c/99318722454.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160724e7d174ec---jezetorobugavopewusijimi.pdf
    • http://klubalfa.org/img/userfiles/file/52065151985.pdf
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/25591219024.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=conjuring+full+film
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 16792 bytes
font_01_sfnt_off0001015d.bin
23417cb9c8c356fa31a59ca2d66b4da439c346b1841086fca22aba719898a4eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 17212 bytes
font_02_sfnt_off00012e99.bin
5d3ec82ceae13fe23529f41d67b294c17971846b2c3f6349600e942d78d5b55c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 10256 bytes