Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2aff773a68483f…

MALICIOUS

PDF

127.4 KB Created: 2021-09-06 21:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69e38313614cb207616213fe9fb73735 SHA-1: f424eb0ec8482fc1628cb61b81e72d1ef5c60a8f SHA-256: af2aff773a68483f13f6a417fa07572e179d79e57aa3a0e5d5382f0bdbf15a90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=shimano+hydrauliske+skivebremser+manual PDF link annotation
    • https://associazionemusicaviva.it/uploads/file/xulus.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7bde1410d964f9f15a529ab5376b1ebe/24971753008.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/roviruri.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/tajuwezewesodonorixujifu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b49c1f0d7acfda634adbeccd0e52db8c/budug.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/pitipozavexajizudafi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cba03c7eb44f232fcbea404af738cd8a/zariloradolajik.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1b4e27bcb71fc5e98f73ce8a84ce0a0e/55986735907.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/32440739560.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62dba3135---pogamumorajife.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/b6ghsd36aphj2ts93aenpqa9ub/11253526318.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160987d2987b18---zolilinijonexuw.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/pefatawefege.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/26200482968.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/24241343326.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902020417.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e26e1b9be5e8c2299d31923957d9fdfb/66672826053.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa30b1d04---kekupolutu.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/02889318f759713fbe97c71971bdcd49/20384833621.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e484e8417---85390846111.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/afcafc2627bb9eaef29ffb9acb66052f/siniro.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/23712691514.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051549469917.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/91869297424.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/pubulenatep.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_off0001894a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894A 19908 bytes
SHA-256: d9da76a4aa36d5cb9131011e9d5bf9a2259d0136a5917e54233fd703e3eb7cf4
font_01_sfnt_off0001bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDBF 11000 bytes
SHA-256: cdc61711a71569c7b162840abd8cefe824d871ff32c4cbdad2ce6531dd245f80
font_02_sfnt_off0001d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1