Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b3e45259d819fa…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 01:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a24065ab13d70ed24ed60e480feda797 SHA-1: a9cc094bdcd833c8b7dc0451515fa50e22a65898 SHA-256: d6b3e45259d819fa66d3b1e59888453adddc804c0dd44f8efd538de5b94ed2e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=tap+tap+download+app PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372e2a2c638---31531937568.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/rorewerovasumuluviretu.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910210442.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/083c5456492c546e04de8b4953aa88ea/68141636005.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210909072153683758545.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138374fe27b4---zoxaluz.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dee9d1b4e---bupijewol.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/mijazu.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/90371228844.pdfIn PDF document text
    • http://futboltotal.net/images/files/84284514320.pdfIn PDF document text
    • https://tsegypt.com/file/27156011512.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/tosositulovude.pdfIn PDF document text
    • http://raczcsalad.hu/files/xupafovowafigomuxiwimab.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/sepanivojovuweta.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ikg1ro472j25cvv1rsk2su1612/55747758576.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/mupakixumukixadesalevakiw.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/nigawewixiw.pdfIn PDF document text
    • http://airzo.net/userData/board/file/80577378361.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8516dcd9f49bad917a9c6c6383336061/39756399562.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/72735921911.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/60212368416.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/71094130685.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/monagelanipop.pdfIn PDF document text
    • 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 9940 bytes
SHA-256: dff5161f00c9b022def4a3b02b5dcadc8ed3b2708862522611909b2a7b134b2c
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 18052 bytes
SHA-256: 61340761f96134691122aa490cdfeea186be41294847cc255c1001d4331ac3db

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