Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d11a738127b55d…

MALICIOUS

PDF

92.9 KB Created: 2021-09-02 22:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 418dd959597f64759692fb300f535ce3 SHA-1: 6071f5f8d839564bb16f5922305c4d73964e9bcf SHA-256: 50d11a738127b55d9c6d3d3406fc76aeaaa5cd62d4099da3d8f5d2b15feda500
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or link farms, indicating a likely intent to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://espressobuilders.com/app/webroot/files/userfiles/files/49806947958.pdf In PDF document text
    • http://vinczeandlaszlo.com/upload/61765438961.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e1c540ab9---sajuw.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/mibabilumugites.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/xivolajasomulafe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a230943db---nezabukazenabonuf.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xiwemubudikilewuxupowor.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/37541851123.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/rj730r80e4s3eg1146v94mkii8/jowilivifuduwikukejelax.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/wofuzobefifixarutifaso.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/filorano.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/01h1v0a9v78jp19lhrggghjt08/25091676368.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/16319869143.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608311b9086e7---87796848350.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210719132154.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/76091149934.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3a464ecb---69084396434.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/20607587392.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/gidetuwesewa.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb73f69228---bikomexojoxalozezepinebu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g71c338t8854utk64161is97a3/74230283606.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/nolobavuvobovivefejixa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/acd18130c7b9b75185c6ce901f38569c/folugikofusesavewexozi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/115a86f26d9de85077a12daea3b09364/40388048334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=parasitosis+intestinal+pdf+mexicoPDF 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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 10884 bytes
SHA-256: 5279fb7771b756d0d54bf24f2420f59289b63f874bb7fc796d9d44f2b1e75c8b
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 19060 bytes
SHA-256: 354dc3059120277c85d1ed76bdfa93403c33c005a2e1724d30e7a83cf37d310d

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