Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5ee7c9a730f691…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 08:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5879a17b4c0901c3415eba0136b179b6 SHA-1: 6e8f20b9e8ffb223407e9d10fb1485f690f3c402 SHA-256: fb5ee7c9a730f691c7c3978e32d8e9d6652049cac734cbaa6bd9fd2885f83b04
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised WordPress sites and potentially disposable hosting, suggesting it's used to redirect users to malicious content. The presence of an IP address literal in a URI further supports this, as it's a common technique to bypass domain-based blacklists.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41cba4ce6---kitiw.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abc070b1d---vewumamuxifakura.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bd7c080471786e27da30e864d63aafa9/64808807323.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/sekijuxuviri.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c4ac3a89---gonukozukoreninas.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dfaca010eb7ac03d03899bd428969b89/59876992473.pdfIn PDF document text
    • https://luminex.pl/upload/file/95720789989.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/o7a357pc2nt52ast116g906dau/2063622307.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/35843558143.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210706050747.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/53032604926.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a9754027---bilegimozoxenuzefudep.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/58535811932.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/51f56f4e93a86c052037c6c19759e25b/xevurolamalejixisigiv.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/vesolalikugozobaw.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee263d001dc---bilanawuvubakozodovo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/89576651271.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/70249837837.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/12893400754.pdfPDF link annotation
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d0b09fddad367e57e7616f6f5c37335b/birifuziramef.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/61089932156.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/an5bs5qvbpejhjimk37b8nbcub/ludopuzogarujerimuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=strictly+come+dancing+claraPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 10736 bytes
SHA-256: 238264fb8cc520d2d3df595313f9bde8ff690dba13fb4320e4bf048a90edba4f
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 19480 bytes
SHA-256: 6b623c021c7c3a9f7d274ce78f5eb1f6a5a636431eb5b1dcef91268343cb7c0c

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