Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f249c7a768f684…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 22:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee99b8131e4e5aef2ae98624e9635577 SHA-1: ad552ddabe7396194b464565bd791aba66f88a5e SHA-256: e6f249c7a768f6845108414515614f4ee6ba409ca751f57b4574748adaee0232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=someone+like+you+sarah+dessen+pdf PDF link annotation
    • http://tecresconsolidamentorestauro.it/fck_data/file/10842025897.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/55076293727.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/46688000853.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_101551_118.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2fr3iaumagf6ee7mq2smnq0j94/bituvufuradexirufiginur.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/94583489090.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bba9ae40c062155ac058f8380fba444c/30546551943.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/wezepedimemovizas.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/61880305051.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/rigosufososotekanefakob.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/99609493632.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/31698958216.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wovenesosezefow.pdfIn PDF document text
    • https://kueapem.com/contents/files/nejubozitepan.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea39b6f9cd---70135487972.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/fuvagebil.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/36745307836.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/risezaxodajoroxuzetiluwev.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130c01ebe360---wawivanakurugowor.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109041321514461.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/buvepikubo.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/pikojoxaxamov.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/pukoruferavituzasofuzosex.pdfIn PDF document text
    • http://secoinblock.com/upload/files/71641851161.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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 11044 bytes
SHA-256: dc5a606dd2bb42febaa2264200ce9d455c780200f744666421521f25166c1562
font_02_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 17404 bytes
SHA-256: 483176a634e9f3849076224a6067d368f053ac3fac90ce8359d93298db4cc1f5