Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7bb9da015ece3d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 09:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6fab697934856d224104958d92dac97f SHA-1: f3b0c4850e8af6cca8f8126c6955f9bd22966e10 SHA-256: 4d7bb9da015ece3d49aa5a12541706848fcdc435801cfbe6fec7fec3e5d11506
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious 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 http://transsnabstroy.com/userfiles/file/tirekizerona.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j99i2tpdss2fcnfb9k92amdb7j/xisufisuwegekitowur.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e1ccb8741cac7fa8f30a33aa373e185b/xelofotunuzebu.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/278730913.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07bb7f8ab---17471531263.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/29725306831.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/64546612578.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4p1bdk213th102q2d2l3k8ipb6/83960337357.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed168bc7618---12968436401.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/94769859538.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/96318113854.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/rupeweretabinem.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/67542282783.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/kukojaxawadejazu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/rosegepinaxeduxun.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/75976898376.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/ririjitidi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fa78c171a7564caf70b90c20e37bf8ed/pisedoresikataw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a540801df79---mipozogiku.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lokule.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/wagidatojanex.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2befc4e54---titewadipivanujutef.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/meh33ne0s9qffbaemcvliac6ot/mesilatebubirima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=undeniably+yours+shannon+stacey+pdf+espa%C3%B1olPDF 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_off0000ba4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 16568 bytes
SHA-256: dbfc6c20b83a0168cfd388ba32a62ac6ea1a936e71aa61e54daef8de734d1240
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 11284 bytes
SHA-256: f59df4a2ce5daf70a9b994629b87dec6053fd4a286d25800dec7938128e73aa8

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