Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadce8a622748dd3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 20:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94831f35a38a60321caeec9827467dc5 SHA-1: 06a8588cab2f1dc52881449a1fd8efa168278109 SHA-256: fadce8a622748dd345bce84ddbe0b6ab54a51757cf2233560ab385f0ca34889d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=multiplayer+games+for+android+phone PDF link annotation
    • https://reviewz.eu/app/webroot/files/userfiles/files/gasujufipipugof.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/87301481487.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/84823551196.pdfIn PDF document text
    • http://labonscafe.com/userfiles/siriwivofexomegolisodu.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/potujiji.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/roluzovemowosogusamasu.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/72988701609.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/xorepevilixogigobem.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/54aa108fbd4873f94902edf1f2c80800/konesemumo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qbg42cnubga867mje87pgr8ked/fupoxumuzikuzokapaxogaka.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16177443872.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/marixam.pdfIn PDF document text
    • http://underbutter.cz/download/foto/lidozoketalirotagotalo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bitezalixuwodipamugumoma.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/53663290022.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/fadixowexepen.pdfIn PDF document text
    • http://mp-journal.com/media/file/babizaviwuvowovet.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/ketudumitovujav.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01f865d3d---sozetuxukubujolupe.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/wapetavakozu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5d672278eafea2cbd9df6eac5b655a69/saredisaman.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/memokuvopuwu.pdfIn PDF document text
    • http://prompol.com/media/file/mekezisetagiz.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 11152 bytes
SHA-256: 7984172489152439ebb711dd43e5ce7ddf423bbdc7f4b4455460f1ee2fdb3eba
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16960 bytes
SHA-256: 04343351c3b237809832c4657ff1cc188ef18ebbfd2f8be87c6842cd9f1ca134
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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