Malicious PDF — malware analysis report

Static analysis result for SHA-256 e712018f3ac9596d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 21:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3a6eca622ab0cdbb71a25bce9adf71f SHA-1: 3e09c1c0ece6565da1a0cc22af26ef30ad0f8b2e SHA-256: e712018f3ac9596d2d37f974db8ae70d571f473cf3a44f0e86234e2a50dc428e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bae8a2c5---xopokokadidumamipuzereve.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420eda2bc89---kubazutawunovunoxibot.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kerekikin.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dukanobewedopimuxosepi.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/vozepavize.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9d61f942---nukelugorekixelavi.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66207636454.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6c2c87f2ddced8fedcfb7dc311ff0f16/vamesenuda.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210917211730.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xetoxat.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210911_2d9e1.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6d3b3hn6tt8hseeipvmpforang/81291872303.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/49846e57edd7591156d1f0385bec819a/94469285455.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/84555791444.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jumaxivekupa.pdfIn PDF document text
    • http://ifap.it/images/file/xesin.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/72911890064.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/palute.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/vosexusuvabezibafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+background+apps+and+process+list+on+firestickPDF 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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 11204 bytes
SHA-256: ea6fa12f6713c8f50ee3761cc03c0ff426169e03966258785b09a05101075133
font_01_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 18012 bytes
SHA-256: d10d836ebeda2e93c21d5cfe4215c557c5aa959ebe9d5579526c5b67ee229e5e
font_02_sfnt_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1