Malicious PDF — malware analysis report

Static analysis result for SHA-256 86944b45a6a044a8…

MALICIOUS

PDF

91.9 KB Created: 2021-09-08 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 055baeb460fe2f29136ad4c6f81b3049 SHA-1: 51a35e2e1aa0adf7d2523dfcec4c18c0bb0e7be9 SHA-256: 86944b45a6a044a82b29b5a3f38588515cddbb09dd8843b328e47b6ba9e98462
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links are designed to lead users to further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad3187bec---41953015764.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b0ac320e2bfa066b990542b380c6cd2a/mofudabosa.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7d5b9d7e6c5bb485c456ed4f8c6a650d/gemokifobojoruvubadogese.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f71e494b1c6---vokojuf.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210725_172129.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hh3uvq2tak0uok4k830v956sul/laxeralufufimagi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/napulam.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/didof.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120611d4b786---tebetedapanemopofa.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/55521943517.pdfIn PDF document text
    • http://homestayhoian.vn/uploads/image/files/bagesefux.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616ee3fd50---35794475601.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/puxalamudezi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/084c965220fd07e58e29b7a97ec1b3d8/pedusak.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/143446897.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc4bc2470---jiguzakekuwi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7ea01008---69929422991.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/seborowepubez.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115d024ada5d---68814235789.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/9515501506.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb6ebe9b6---vopovufaxu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/65160380968.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4c3b749b7707644c7fede9040f605e2f/86985432623.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sigosivezesabewazazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=list+of+most+commonly+misspelled+words+pdfPDF 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_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 18132 bytes
SHA-256: e942be2cda7a2396c43232d24670894d46b9fcabae2362e089c9329d0d5c8e97
font_02_sfnt_off000148cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CD 10776 bytes
SHA-256: 803626c4a61ab1038bac3d19938ced5bc189d88c4a0dadb481ab7fa756158a3e

Open this report in the interactive analyzer, or submit your own file for analysis.