Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a1c13f6a51694d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 08:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c2638f032adb406f7047c6574c105aa SHA-1: b7676a25f101f913d7b3a7dea84eb776e1ad4182 SHA-256: e6a1c13f6a51694d962ca2cdaae55293668a3cb8101171d2cf6216141dd63197
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The embedded JavaScript stream further supports malicious activity, likely for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=kinesthetic+learning+activities+for+adults PDF link annotation
    • http://medical-1669.com/userfiles/files/28020699682.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lirisowafuwodegusaxuwuke.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135655c5e8d6---5093929000.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/80227422288.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/jidezerabo.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/24488543783.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/19435854876.pdfIn PDF document text
    • http://heureka-cz.eu/files/99211671551.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05ff05e9b---warilutanuvupojolalivagar.pdfIn PDF document text
    • http://teknis.it/userfiles/files/8042822100.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/65888197054.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707ba36b57---diniza.pdfIn PDF document text
    • http://yuha.be/_files/file/vedeberosikori.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/31279793211.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/71607149664.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/23557358158.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210919_190330.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/towibinolax.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/65023343960.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb87aaa493---zugizigajixoxuvutivo.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/76515881050.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/gozerinigosewalelidunu.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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 10912 bytes
SHA-256: 5a3a106c0047ec3a4dfd063de8dcd9bdfba9e06e0bf2499d68b55f0ade1ae2f0
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 17248 bytes
SHA-256: 5d079989f43daa6ac9d55181c5a2da418235f1dba8ab0cb363819cc9a71bb9a0

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