Malicious PDF — malware analysis report

Static analysis result for SHA-256 335ae10ca7145381…

MALICIOUS

PDF

68.0 KB Created: 2021-09-15 15:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc64592ac95a93ff4c653e788f66d971 SHA-1: 75a6308178850129ccdf75612046100bfc422f67 SHA-256: 335ae10ca71453810c3f8ed87fbc1303fded353d0622628f02cff59f1bd8d2a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sunriverps.com/data/editor/file/19059396961.pdf In PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/xutinegofavazam.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6lupql1nc0ua19ecsn81dfov40/59617312944.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090303445147.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7db5394e---79538127279.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cbf7f384---mivinetukimujupazajew.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/kuvubexajogafan.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/mapikaxogemeje.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/66834097909.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/sosixumigetulevebivukefow.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/wetedemozededijer.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/gofudagatabu.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gezawipesokeloxipabesupa.pdfIn PDF document text
    • http://wawa757.com/uploads/files/31372633769.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/10837177396.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/41908558894.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/81701217854.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/smhitsq5ef30c7grclge80jj43/domawebawof.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/50095972823.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/gawesoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+gta+3+downloadPDF 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_off0000af1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1F 14336 bytes
SHA-256: e04baa9faacd2723999b86cb529f7bd7ff3e99a6875d326a89dbcfe46c448611
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 10364 bytes
SHA-256: ad2b82995405c2a0335e9d9c8ba7d60ce2778f6716baec2cbfb7e0d879764423
font_02_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1