Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e377b304533705…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 21:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2d09a6cf8963b0b768d64d84e075922 SHA-1: bfb5da6959819219ea2b45e9ea47938f809afd53 SHA-256: 09e377b3045337055cd57dd80967ae60bde4bbc78dd7f1d318b196118795d060
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of JavaScript suggests an attempt to execute malicious code or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/22861062856.pdf In PDF document text
    • http://orthopediedelft.eu/files/85309267590.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/reriw.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/68169959052.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/1685730440.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/52429402070.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/janajefokofobumuzefunowem.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/mumiwerezusixivipaduf.pdfIn PDF document text
    • http://stroi-sistema.ru/img/28027132211.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/61406331707.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/noworovefivi.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/pogubibuzakufiritav.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f3e8c85f---29470174077.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vemakurabovoja.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/jareterazifafo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12ffaa8f4---wikizekegesuponajilogi.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/59684485391.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/94252112910.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/93812824009.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/pivuri.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/21588698763.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd45a03757---98724957706.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/lasaxibisetabanemuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pixel+gun+3d+money+generatorPDF 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10912 bytes
SHA-256: 86e33699356cf69f9b2e2bfa081bd19ec8de5f735b6c04fb0841f04afd5204e9
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 18068 bytes
SHA-256: 7160576da816dc28444867aa07d605df008ebfda71850afaeeb5e0013ba23222
font_02_sfnt_off00013193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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