Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a511f92f1e6f4ff…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 16:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a73dc2012af5d8e5a11fb69d7fc2dc9a SHA-1: d319fc518a8de4ed92667b4351aeada8170cc02e SHA-256: 0a511f92f1e6f4ff6c3be1a90de07de1ff7c82eb950135f01eba78dbc62bba43
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not directly executed in this context, suggests potential for further exploitation or redirection, aligning with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942796158e9---97715864728.pdf
    • https://naoshima-habitant.com/66741277762.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6544e81d0---wubizusu.pdf
    • http://altinay-law.com/images/file/dumuxivika.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c93f020c92855495fb93554186f7ac53/39157031738.pdf
    • https://parklanehotel.asia/userfiles/file/bazoxurudox.pdf
    • http://nsdadventist.org/FCKData/file/gebivefepow.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa64c974b---jabogiv.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a27340967eaa6c35035e4f840b232ddc/31304057038.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4c4sbjpkuovrjn8p1g12m5ontl/jaxegijediwoxiwidovatasu.pdf
    • http://edgecs.net/documents/56795306543.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ubogn0ag7csa23rcbjsqcvpih6/52027336530.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mvf2q5u1u17kqrtev3ppo25vtf/11118421450.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0r8ct34cfkior95rtl49jrqiu3/tumuva.pdf
    • http://farashimirooz.com/files/51331625439.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/4445795324.pdf
    • http://pillshop.ru/uimg/files/66388459899.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446a2eae6c---81446583756.pdf
    • https://fallsplat.se/file/kavavilariraz.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/01d9a167765f3bf44f3ab75a6eca6747/4344330907.pdf
    • http://mtecommerce.it/public/news/file/paxazakakasukitijowafaf.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda563bc04---6073810691.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ece9ad919c4c9b04786925cd1b22aebe/81930331036.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6fc4306bb9ee67f561f72faae9f0a1f8/buzuribaregeba.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/36198185886.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f6cffbbf2ba79de5361bc3e7010cae2b/95261917086.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=effect+of+cutting+trees+in+environment
    • 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_off0000fe8b.bin
0c93f919280eaecc6f00e7b9b2ad0a81ebd18e77102bdaeae3192a8fe3fb6f51
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 18436 bytes
font_01_sfnt_off00012d2b.bin
2f12482dc152939ea480b6712fc90ef0b29da28dab1cfc9e762d4bfdcb694e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 10620 bytes
font_02_sfnt_off0001457d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1457D 16792 bytes