Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a72cbcc4d9b3d3…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 01:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f12d6399681f9d5d716d2bafbb4a6043 SHA-1: 0b84c63979d2a89b2fcd3b062a5df31b6100751e SHA-256: b4a72cbcc4d9b3d35e0aa0dae32b1f89ec731ea913017f207d852e796e026499
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting a potential SEO manipulation or phishing campaign. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://espokebar.com/uploads/files/zizalaxulurinorutodu.pdf In PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/21948393661.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zopajokaditanedasa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b679a5825e0---72447747902.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d626766de5a---7346958404.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929a2a6da10---lefinikeranuwopij.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rf3q46gbfr4avbfjcl27rjug4a/93612832763.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/19840982069.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/82816040139.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zewuzarikiragogawal.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/46357063504.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/67117054552.pdfIn PDF document text
    • http://artospace.com/pics/file/33842436412.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/nipapevamuvozis.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/75649041160.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8fcfa0f2bc408e00daa1970065ee2d14/zonimeti.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/zagepojamevojur.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/gajexuwapifuzogawo.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/nepegen.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/36013659181.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cecc2deff01---mirebababodaxubagipilad.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/77105032405.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e726a8e2b---86400046027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=oswestry+disability+index+arabic+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_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 17664 bytes
SHA-256: 4d03a384d70aabd32ea390c8afb703dcb1ffbe23ee2288506dd851881f169a4d
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10960 bytes
SHA-256: 381b8983bafd5679ac4f02a576bc3d12682e805af0871f3b2a552e237ee00de7

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