Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3718f795941f701…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 21:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9534156fdecd6692bc269e5c2900871 SHA-1: 747ad024cbe6d3c8c090b62bbf9578e2703b9868 SHA-256: e3718f795941f701c108e6b1e9e5a664250be77ae34f618228058bf47aa8f328
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to host malicious content or phish users. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://108pizza.pl/uploads/userfiles/files/minibopokefovejanawomusin.pdf In PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/wuxutuxodadure.pdfIn PDF document text
    • https://hoalavender.net/upload/files/96911344164.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143dfefe7859---paxilopuwidupomifexapovor.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/14567872655.pdfIn PDF document text
    • http://talleresjpg.es/img/file/9343123236.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kadalidebuxup.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/degib.pdfIn PDF document text
    • http://grotech.in/userfiles/file/88199543214.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/lebagisewibavanufutifutam.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2b1eae077376a9467a8ac799c3f0aa54/24132223156.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614745f07bff3---zodanupokewojikitatopim.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/64556917280.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/46223389903.pdfIn PDF document text
    • https://znalac.com/userfiles/file/tanawavuzuvelerure.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/buwirivisijomojekedob.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/44887107927.pdfIn PDF document text
    • https://network-italia.it/file/lobuvalijekikefononalog.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907110625.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/94701666329.pdfIn PDF document text
    • http://zerosquareonline.com/file/muzivapanuzex.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4253742ca8e6bc9bc00bcbd80db129d4/61615329454.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/97303997271.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/18014986986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ml+hack+battle+pointsPDF 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_off0000c122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 10596 bytes
SHA-256: 1abb17fb5d4dd492207cf27b09f8e873259939684f9df4a49afbbf8520a8f25e
font_02_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 17148 bytes
SHA-256: e8cf7c52c0a47e5a011ee640efbe0e305cb12a8c7d3c1dd656fec41c48ae90f2

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