Malicious PDF — malware analysis report

Static analysis result for SHA-256 e109c111cc508b5e…

MALICIOUS

PDF

73.9 KB Created: 2021-08-31 19:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38b87a53feba889d3702b8fb45b3cbff SHA-1: 904d80fca3cc950d70c8b43d1e6b1e430a7d0054 SHA-256: e109c111cc508b5ebe99f0773005dbdd6b9b2d52cf53c027f956e5cab2ee320a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code. It also includes numerous links pointing to compromised WordPress sites, specifically targeting upload directories, which are likely used to host malicious PDFs. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dcb4462be---75471040433.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf6253f89---nobixobesilawara.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/80253546679.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/jewovuripupow.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/74964055882.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/bawojorolurubujefezapen.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/kiponizakewitasenojo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090096c6efce---20837819466.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0a8ajgfrho26358qjedh4hcij1/rufunalutegemizi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/8678649797.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/79191490772.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0piosibbvn6f1bltsmno34hvpp/77821707985.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/tiroluvonexorog.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caabf665ef9---8791372865.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0c6744fd---votidomoba.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/33372125811.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/96910022464.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d13ecf2cd---tokumejixusukokoxoremibu.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/misojusuvibozapefado.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24080581298.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/68495816984.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/28850933789.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fea71frgrilfq8fugkr4l0r7at/zipuwibiropuneri.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/jumefasopewafuwowekazed.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/guxexevobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=augmented+dickey+fuller+test+rPDF 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_off0000c051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 15768 bytes
SHA-256: 71533eaded7fd1d56be398f7fd6c7ad179140791cea7e5906262e21ce19a20e8
font_02_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 10824 bytes
SHA-256: 9f84023eefcd87c824e76d82904395db0f4c88590656683d63fa2352292d9eb0

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