Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbe558ea02e6f26…

MALICIOUS

PDF

102.3 KB Created: 2021-07-15 23:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7ad9356678e55efc32b588a4345a4f59 SHA-1: 9f2604f5ea927fe467fa8ef7b2efa6a0ab5d5660 SHA-256: 2fbe558ea02e6f26fab8b94a281fcef02dd542c373f16e680c2c7f39d0232cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on a compromised WordPress site, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were extracted, the structure suggests it's designed to redirect users to potentially malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6mhk1nv72tsutcicg22hc48e5m/19873392328.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7e009874d4b8f3320fbb6fec7bc7d1e8/xavowofanuwovezo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9bf1da596---85448530569.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9825390dfc---riwurepa.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/291499046e8781489a100125b5034bef/69853533560.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e17775f9edea957bc217fcdddc2ad8e/63962665018.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ges32407uk86967jtj408hcus/lazusu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7632518a3---66132004749.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b2517aba---tivonipiweriluwadige.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f079f64eed---fadesiwepow.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4tjb2vgvlri35qmp4hphmdnja3/wuwutemimekopamerijudurax.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/54182254309.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a27c62a37b24bc877e744800cfeecae9/jejusuwipolaru.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d235c4b4e2e---ruragadagidem.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731bb33014a---7200480866.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50653a6ca---voburijedubu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bf9839484681261db642485911bab922/xumodebowifukatelega.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kumunisinelukakitozotob.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b649702a472---99127484566.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/kowiwefipiru.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/raxiz.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b14664ba9f3---sijujonipuritukej.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/98095988460.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608912105eb21---35399509500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manners+and+etiquette+classes+near+mePDF 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_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D4 16996 bytes
SHA-256: 19d1a350fce2fa3152a339601c75b78db8ae5aa84fd8475f48c8e69c835af12b
font_02_sfnt_off0001736a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1736A 10652 bytes
SHA-256: 80aaa35ab48c0aed845bb58ba2d2e21261344761ea39c1dc91cfbe9745bdc2cd

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