Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b95bb28e5d306c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 03:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a360c528f15be51f7712921704666f82 SHA-1: 33a89306353c16ed38860d6f6a5a9c0fe81a1f90 SHA-256: e9b95bb28e5d306c63af7017ed8d4acc76d5747ae83d97d4b8a6583a93b4af0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to phishing or malware distribution sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=mobdro+for+android+tv+box PDF link annotation
    • https://ofly.om-digitalsolutions.cn/upload/files/zitom.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d8dbce7eff616f91e563376ab481f2f4/gekamebiwoburiwesimazamop.pdfIn PDF document text
    • http://shahgrp.com/uploads/3252896607.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/97675179934.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/72143699169.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/bodutofuvudulapat.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nixotuk.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210909080227.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/56373493862.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/tufasiwe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/muxawavifupazezu.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/3231989719.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/53176859474.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xefogasudu.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0fdb563b---tedaxefuza.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/kezabikegerigodul.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/90070012226.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613081081705c---26646698237.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/76206004768.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b8a65713e923aaa0cff0e4fd11ba8c00/25317753703.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75534750103.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143aff7b25c9---45810916804.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/19223810933.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_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10304 bytes
SHA-256: ecfb0a32897ea9fb3d778d78018bd6b5b65229122208cc6785eb0f9cc5a178ae
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 18016 bytes
SHA-256: f3ad6d9b34baa39290d383605ac44979b32fcb2b541bebc66ed8b69b095f3abd

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