Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be88ab267b490a3…

MALICIOUS

PDF

67.7 KB Created: 2021-09-19 02:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66cd789757d6dd33bd204b13235b5327 SHA-1: 89b921ff3664947d104c801ca3c98a93bd0bca1b SHA-256: 7be88ab267b490a362cbc909ec3c79b0ddb47d52f460753d10d34f599d01c172
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://honda-vo.com/upload/file/nasid.pdf In PDF document text
    • https://dom4m.de/userfiles/files/xuroxipeledugi.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/sogebasalowoxivajewes.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/50188368412.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/pafitikataranejizek.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/78010741167.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/36508186085.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e68e3827f---8169842721.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/pikufewal.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/xapixidibu.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/lobopegir.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/pigetezimowoferuro.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/22339433482.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/69906584452.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee315a394---94895106844.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/94800745875.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/59982219138.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/fedezonomoweri.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210905105155_1227063318.pdfIn PDF document text
    • http://xsteelstock.com/d/files/timawapufidiwigow.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8258dc563---vokesigedezazag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=business+english+negotiation+pdfPDF 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_off0000acf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 14620 bytes
SHA-256: 349506248b2415a24a836a50052aecf86c0f84b409eb4c12dc037d0566cb4205
font_02_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 10828 bytes
SHA-256: cddcf9e95858a2b9a1ad189d80ebf797d3f9dda1273216e1dbe60f71ef4d228b