Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ae2ee42212754…

MALICIOUS

PDF

96.5 KB Created: 2021-07-01 13:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70101b268f8a933a6bda8cc1447c141d SHA-1: 113fb444172d89a7583311b118988932d677e371 SHA-256: b23ae2ee4221275443167d273008028dc8d77d3df2658e77fa8f77aa29686362
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing or malware distribution. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=virtual+ice+breakers+for+teams PDF link annotation
    • http://rockycheng.com/ckfinder/userfiles/files/paworemibovukomosori.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/bapanelujosuvomifa.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/36q4vvafi1hvnilgffjtjn8vth/11498670651.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rerobegotadokabipojob.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6gn6mi9bnfrludod1li6e3dnb4/30058671664.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bolemasugoliruw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/nolix.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zeminodelaxerodizifapugof.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0533c2c1---jeruzu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6cf2cbb91f87e78723ab782fd0f4e392/tejuwunemitudanuz.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7a41f349---durinamavumedimakorutakin.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4h4ifun19tijh0c9ouaoahois1/nuxokuwesiximupomifip.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd2vslgjuro6srb6bt9hjv6ih6/fodisumezadirilewet.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff51eba14d---59842271101.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84030106391.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac70b3b169---verer.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b446e3a90---7401899246.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3cdc5fb94059591e512757b5e18bd213/65475462400.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/pokopumerem.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710a06d4c21---zujelawuse.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/belulum.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9588f2945c---57569103431.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/98663780951.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ad5c6c196589a8e3421ea0d9d444db0f/rofigupabiwaxokijogi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/370632db92762c09765033c347266cde/15440304573.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_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 17552 bytes
SHA-256: 3bac21b9a262949aaeb4e08b9c7a13a2bbf5ce78e74dc6ff10b997d000fd60bf
font_02_sfnt_off00015a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A62 10692 bytes
SHA-256: f113e287936ec6767dd52640aa0df38d5f77f2930a3d0b464d5023f2398c30a7