Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9911cb7a35930fe…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 07:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 614c31fc73596b756dc2290956244e12 SHA-1: 99bffe9d849245a26ce7bdf28c7675977d66fdf9 SHA-256: b9911cb7a35930febb84882a9a4881d9b4eecdb17b30c55afc5320faa0e84709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised websites, likely serving as a distribution mechanism for further malicious content. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f1d96169fdeea41e5c3386374d46983d/3471290678.pdf In PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503024126.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec24e3f872---80291690403.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/3el3132e5vaae9ckj7d40ghg9j/1531384923.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/pemojinojevukibul.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7g490ngjgh1kkp3gsj8kni3937/32649795631.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/domavadufetusadedizeg.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb9782f50---2967234682.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607faaa977719---nexosobom.pdfIn PDF document text
    • https://rosycaffe.com/file/56205095802.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kv3a9pjhpmdjffberenq21qrbf/masikunujegawe.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/89056114813.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/87976064337.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/sivavigixo.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d3c3b2f4f930efc31a3533c7d4d40df0/71452124386.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7fa16b0f---naterawadu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/29304178763.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7ee2c231---8210355684.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5086e4185---26401793693.pdfIn PDF document text
    • https://service-panev.com/userfiles/puvavalijizidexe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce59584771---kesepagixonuxekefusa.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf715dc34---kuvadinososuxesowiboser.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/xizowadive.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/l1k50l0i1reh5m03uhf4c4r39t/69333202066.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5so3iri69bb9d0g39op1u8h2o0/92909265247.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6aa8f3e90---62822759817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ppt+combine+to+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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 17124 bytes
SHA-256: 9a90bd73dd898fafd0ed62fce36017b50844ab98d6ee87a180ee20ce32d38075
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 10448 bytes
SHA-256: 9b7141fd9463ff45733735329de2e722df22d461b1ffe3b8c88ac06143194c57
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1