Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6f5340969f8111…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 20:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3557ea592ce3a7e7e69f7df54f5d3099 SHA-1: c5325701338c8f4a10dbaf7d2d341b74b79f8063 SHA-256: da6f5340969f8111939eec3ffbd795824bdc7bd4b7b6a321ed1e5a36f5dab33d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://actor-conseil.com/files/file/kuwexeku.pdf In PDF document text
    • http://tavaszitura.eu/userfiles/files/90988585765.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/3967094416.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/47263296269.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/retepamamedubodiva.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36ac1f957---32314093334.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/79054471212.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/rixuna.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6r2l3a2ldaer6i3hhj08ilurg6/nuxara.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/bufejusisikuraruxaxuzol.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/6759803071.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/48710100942.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/zarelubu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ngc5863e5nlbsnco893fbl4u09/felogubibafimipizezixegom.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kefigi.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/watigugabobol.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/16f2b5b81a62c13d162fcdc827dba9be/60350007806.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bc4788341---nodegesugulazezivit.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/dosakamufefilador.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/77855441353.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/8c82acd2be11239856e5449267349a7d.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/fidugoxexisefelanot.pdfIn PDF document text
    • http://fivesteps.pl/userfiles/file/setinijikejamuketo.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a0ba98700a616ccf9179d85343a57702/25001277145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=zip+code+for+squirrel+hill+paPDF 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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 17592 bytes
SHA-256: a47cc0ee1ba8cdc405f80dafab76918e15646d5caf079832ac7a4c98b4c084ae
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 10724 bytes
SHA-256: a08baabb23293b99b61bd032f3c7ebd438826120ac1588234f74571974ed743b

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