Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3b93940ed0baed…

MALICIOUS

PDF

95.7 KB Created: 2021-09-06 09:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1254af46c8d37507d46c224c18e4f56a SHA-1: 6456386cba08ae61beff34ef3066c55439158a63 SHA-256: 5e3b93940ed0baed538a12e0ebb692949371039c978819d2223c3e0285a42f19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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.
  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a030a7ac---18768338355.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b637473b4f6---divexefugesosizupid.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/5485042551.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/61866257947.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/kanawirowik.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/45550071913.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021070116251267802.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/227901b801621dd4625ef18f62769a62/guxatukunuzoluxudazoratad.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zavivosijar.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/55116230727.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/019c981a8fa863a44f865c4b5c50f20e/nofuwupenami.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/rufajogi.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/rariwanoxeduzaka.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e034661651c---20898436368.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/defirabige.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/wamakuj.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/jununogegosaxusagomizu.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/leponadutavo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/lsi1232jp28incisebmh2vled0/jomurizajej.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ginibebusumese.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8af95d636e---51153634648.pdfIn PDF document text
    • http://voijin.com/userfiles/files/36267224164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interstellar+2014+movie+worksheet+answers+completionPDF 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_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 18416 bytes
SHA-256: 136cf93889fff7358facda01a5d0b669216c242f6b0f7e02a6625b1f1430409a
font_01_sfnt_off00013e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 11204 bytes
SHA-256: 4809259c648ab6534dbe525d6f01bf89eb065bbc66df21452fe8aa7dedb46d94
font_02_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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