Malicious PDF — malware analysis report

Static analysis result for SHA-256 231207474530ea11…

MALICIOUS

PDF

96.1 KB Created: 2021-06-27 06:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5416cf5e5a5245b036a1e9199578a81a SHA-1: ed8a36affc759cabeb82ec528ecd64ec883860c7 SHA-256: 231207474530ea11581984741045f4c44f5e00b63ba6e5646585773c4fb876d1
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several pointing to compromised WordPress upload directories. The ML classifier strongly indicates malicious intent, likely to lure users to malicious sites or download further payloads. The presence of numerous links on potentially disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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://krevue.cz/UserFiles/File/26644962516.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/32490260240.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061823146_616772750.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3f90172fa---56963748161.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429174336125.pdfIn PDF document text
    • http://newo.ru/files/files/95349193857.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/91024347329.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc3724710---38448768319.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ca1d381e5d174d28d42e0cc637e807f1/59924671329.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86cbe4c74910f94d3f8e8e955c3a2562/potozonememefukarulop.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/mokapofibitisu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd83b1f9af---wavekik.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/23882086fa5a433a29e462e64eea1452/33039203763.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c68cd87f01528d982cbd4d82ae358d89/xakebifabala.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/48228533439.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/fosiwunewanimexodomawir.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/68410394222.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/pepagidizakalevel.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c8fbf29d5---zabagoxat.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/988d3ca382c02ca18479e10330d0337c/60109302269.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/4635426327.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/cqebcplggvj9j4km4g27eji8bh/jafepapibijirozufi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/60791852524.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608881b4919b4---89913951411.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/40798019453.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/84251483528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=moses+and+yahwehPDF 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_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 10204 bytes
SHA-256: ba39483a67ac58566a046c452182cb018c2a37b27ac3627ffc42118692e7362e
font_01_sfnt_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 19688 bytes
SHA-256: 3683b5d02d211c29141dd35ce43c567c4151a36cacb4005b7afa937f6f41ce2a

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