Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed1df539f393956…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 09:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23d2928a7fa6ef69b1f7f17d8f1f7166 SHA-1: 8f8237cfccdf0a48df2496c62fd44c05b7565c7f SHA-256: 7ed1df539f3939560aed9d7e859dfdf996e1cc5a43fb526f5d60700daaf80fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=schrader+solenoid+valve+catalogue+pdf PDF link annotation
    • http://www.vikingmaterials.com/img/xetixegul.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gmu3bjqdombs4fubn633o9otm0/wivekosuniku.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/midiwaxarofobajetiweb.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/nuxexumetadaxuritinu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210820201726.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/52127365975.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/75916969382.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/1a090c3f2a6b3482cff8ecaee18529bc.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/fupepopafile.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/supusutipubedulajige.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/boxofi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/93535938150.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xijogapologadorukedaraf.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23dac3c0---51798345758.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5b4b9368---nebodubenotexusen.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/giliwidifa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc786a73f9---70967189426.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/t05odp1q02b3fbvq7iee8pbu43/6748010508.pdfIn PDF document text
    • http://aweibel.com/Photo/file/mifikowanoparomeluwel.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/wulijodojizefidizofun.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121a2003eca0---75228801353.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/68391016911.pdfIn PDF document text
    • http://arslanemlak.come/file/kaxuluzi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210611020612.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d209336fa5a---xinofasizefesejuderubugif.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/8224888247.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/26755666948.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_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 11140 bytes
SHA-256: dd063193991bfd8002c8fc5155b9be2ec1c8beec8befbe5e95f00b0102cda60c
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 16896 bytes
SHA-256: 3895b5ae7e099fa8fed56b592717f8d64e728e9b0ec657f563c5065c7398525b

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