Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e75d79f24d2ac4e…

MALICIOUS

PDF

99.2 KB Created: 2021-07-16 06:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e770c628b0c34bb826a0b7fc584035f5 SHA-1: 08dc8362c834296d5f65818c765d4e3aa466aa2a SHA-256: 2e75d79f24d2ac4e87231d50679698e7c2f35617b82f230760d40af185651a74
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment vector. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=graduation+hairstyles+for+natural+black+hair PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44922d724---50950452790.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fd1ef92fa7dd7192b08000732e21dda5/60832340723.pdfIn PDF document text
    • http://muszempilla.com/files/file/8633930471.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/67decb1e1689b7122c0cad23116d2128/bexobomusefug.pdfIn PDF document text
    • https://hirurgija.me//files/6196292544.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wulakopusosefinupupe.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/30e8b79e861ecde3486c58399c76d305/2602011818.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/sipafesefemarujuxos.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95709352662.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jogefegofofu.pdfIn PDF document text
    • http://goref.ru/files/file/dunopidisanepukozije.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/371e7e31aec1b30368c79a7465099460/weseb.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607839b23cbfb---86490660782.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/guxefuvupojeli.pdfIn PDF document text
    • http://www.bash.cl/media/file/zitawibelebisofed.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/16937434593.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/naxajalufagasasebup.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6febd8ad---36899724877.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/04eb779605534eac66570093f6376363/84283690199.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1d0561d9bd669a9ef19931aa70ac148c/9938150056.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_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 17268 bytes
SHA-256: 6faaf225e5968a4279b870fefca6991afb5668ecd0591a58c7b89ad218cbf55a
font_01_sfnt_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 11060 bytes
SHA-256: 7d228dab464e00c8c1bb846724461e93d0631706554ea026d388552a264bd877
font_02_sfnt_off00016787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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