Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a0491365a0e94a…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 16:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0dfec95d9e0af905367e6d8d3eab3dbe SHA-1: 1c1079702870d04c6b4bfa8236f1c7249a402793 SHA-256: 78a0491365a0e94a4c2d7a98669c3929d31f7336364d5a889c66960f0f2cd2b7
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The presence of external URIs and compromised CMS upload links suggests an attempt to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871d7ee1846---mumixamoju.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/eb70a0f92868aaefc3f7297ec3d58150/nosusuberarugefob.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a787820bfff---8891494901.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54294d060b---52973686109.pdfPDF link annotation
    • https://deniz-sogutma.org/img/userfiles/file/vumapowanikiwetujaluwe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a800da9091b---lusejodivifavitixuvuruni.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/343852ccca5d4ef889c0067571f4ebb5/dirisapeganibuwisodivel.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/dupajur.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051617445441.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/6047695333.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ih565j7umsqk9j3vsemaom08mr/megetawezokokovejo.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/61327483597.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8dca65a134e2ddeea8f4596803bc951f/lovafenab.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0bf1b811---xojajelinoboze.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ralogazojadilawenibofa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081f20338990---dipupofekapesezesekivu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/52777552545.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bfhkv55394oqgitoavush60qd0/piminewagotebidulamane.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b72a2919e3e5b2a655d26964ed3497b9/40508039579.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc7f31f67---setisoli.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3efa39537a266bbef493f6bdf37c5068/35884862705.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/huuomd56glc4u4fkfonmh8h0bd/taleparawumojege.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9fdded275c3781b2220b85bbfbaae69b/80129314518.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b7b0a8a1e0c579025625af09f4545179/91350290831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+to+say+for+interviewPDF 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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 18000 bytes
SHA-256: 30ee30b8cde4c95c37f5f5bbe64258cc7803d6e4754e8da92b53feb945b5f78d
font_01_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 10524 bytes
SHA-256: 8194a8a0bd84bcd5c7f8c0a4504f26d3839b5e10291f6538ee46bd34fa7bb7ee
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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