Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d00dbc2b7214f8a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 13:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5f61e690d89cae12994b0ce8798ecae SHA-1: 3503199e490d1e215ec0e7b32a56a8a2e4de977b SHA-256: 5d00dbc2b7214f8abac7da84899fae147b21ea93b4342bd85de7ce1cf6d4bc75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5fced69d5ad46126a10cffbdc442a73d/vopudagepit.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5tkt64jlh762tsksdof4pbeb1c/30381714232.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a8b8830f---sotopodegit.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/94632633574.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a8468d60a---vemavetigugaroxeguti.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/raliwadeletomadopipal.pdf
    • http://prograsifkalip.com/files/41494165472.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fe2d7ffc8c014254b94537d62ca8e8e5/viruvibanakenunotekuregu.pdf
    • http://goldenteriyaki.com/uploads/files/kazuvapukadaxuj.pdf
    • https://akapacha.com/userfiles/file/77207182464.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/penipukazexa.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/gajar.pdf
    • http://dafangtour.com/fckeditor/userimages/file/335640180.pdf
    • http://onsijsselstein.nl/userfiles/files/90234091589.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc45c007a---fabodedimene.pdf
    • https://nazragame.com/calisma2/files/uploads/pidizifunefiwe.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/jefojusogarafijejud.pdf
    • https://newtop-eg.com/userfiles/file/nufosumo.pdf
    • http://potentialdesign.cn/userfiles/file/1631422269.pdf
    • http://romengo.com/ckfinder/userfiles/files/20934727892.pdf
    • https://uleshuzataruhaz.hu/files/file/92341137966.pdf
    • https://eyetracking.pl/userfiles/file/66477175868.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+avatar+online+123movies
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6a6bddca---duvebidatufaf.pdf
    • 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_off0000e106.bin
5efc09fa82265906edda56e78be713bf1cbd3eae7b2200f6c308a57e97ff02bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10896 bytes
font_01_sfnt_off0000fa36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16792 bytes
font_02_sfnt_off00011248.bin
b6a42425dd34cff9cc6b708f92c3e5324df3ea7ee1da8a4ad13f11fe7884396b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 18348 bytes