Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0e8ad0ae6aeef1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 19:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c1dbe5d97b9b4674649293a1ae1204a SHA-1: 22ff8ba5f713f7dfbaa0a3386e212ceabd03b886 SHA-256: ab0e8ad0ae6aeef187666cc8ce328e8e2fd298ebdb2fd6792c33907bf80679f5
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. Furthermore, it features a link farm pointing to various PDF files hosted on potentially compromised websites, which is a common tactic for phishing or distributing further malware. The presence of these elements strongly suggests an attack pattern involving user redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372b3ad5a2b---28937299383.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d424423---39665453846.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/rakaduweginiva.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905115721032.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/40498739085.pdfIn PDF document text
    • http://rinsacars.com/files/others/22590118524.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/pijelidugidu.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/41128163627.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rujegijasigokisoruwev.pdfIn PDF document text
    • https://nasikampung.info/contents/files/nipavexe.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/90210961300.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139610ca09ba---73743678563.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/mibimizexanifizurepufe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861263083d---29380195249.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/birixawidovijadu.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/93899515881.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/gurakosimiwavavupudoka.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/95251079376.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/loniraxatotimabubaduri.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/88078793793.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/87063438253.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/nefumilavo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e3b14e21ab2b2c583639ad514c076687/1804554355.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/golofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gangstar+vegas+latest+version+apk+downloadPDF 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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 21280 bytes
SHA-256: 4e6cd28892e470ad35a78712c434b0ce07103a604cf0d2a7db20700bf424d908
font_01_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 10852 bytes
SHA-256: 184a910523f311896f733320405a384ab29a01bbeb27512d752a6a49fe3316fa