Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7859dbc527b75c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 23:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c95b72cf6fe742027558d83202a9f04 SHA-1: 9568d855c78475962f9821a04f642e6b0c6d3f8f SHA-256: 0e7859dbc527b75c333322ee05d279dc25f92ceb714ed5da91583b4a81aed97f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://s2ipower.com/survey/userfiles/files/62045658209.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/ribuxix.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/ridune.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/xibenidelupak.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/vijimutuwok.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/66788050201.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b465f34b24f---luwolulag.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081da3898684---46085276085.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b408f01adca---51498372944.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/tiradiwimime.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/47532201762.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407968c16d---22601859492.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac945d9bf68bdb435a92e523fe1140f6/71000182556.pdfIn PDF document text
    • http://lucann.com/Upload/file/47159365491.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/vefuguj.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/vakavevasijusemife.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/degogujobigunerosuz.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/wegasedarow.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3f99ce7f388b11017b9a9f4206f0344c/75203010809.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/90ba9712a57a381976d18adc438f0b5c/78035705421.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8db9256e79ed64a1c6796f287a5d72ac/7182470908.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/50981696477.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/nosepivideweniwalixitaroz.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/67524995125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=iob+credit+card+application+form+pdfPDF 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_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 10704 bytes
SHA-256: be94d4c6940e7b197ba3125e6c81314f6c47e0b9d8de364453934c3eb8bf60a2
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 17524 bytes
SHA-256: 4783800abefd727bde70808d7a5cddbc84c17a1975073217e4f8aa246588aae5

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