Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6533ecb385382c1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 09:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f272470b541977619fb5ad471671902 SHA-1: ebab7f06362014dcec471067e0bcf03a277d5e02 SHA-256: e6533ecb385382c142367a0958272fb4d9614077adb39ac5b9f2c889243668e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to distribute malicious content or manipulate search engine results. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=top+free+movie+streaming+sites+no+sign+up PDF link annotation
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vivime.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/jovabeniduxadumorejubiran.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73022319461.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/fogonezogat.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a3eaed9e3014cf7cfd9e783c48e38d4a/sojedapujut.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/xaxidezigizuliwuweg.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/47859813419.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/35e32f6577960f606153fbe9e7a2b2fc/10234919421.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/rubogigavasosupilakesewiw.pdfIn PDF document text
    • http://baoveantam.info/upload/files/10161692553.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/jejejulari.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/vinisapetikazoruf.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/98520177023.pdfIn PDF document text
    • https://tessuno.com/upload/files/6134d424c1c6d.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/woxasi.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/36445188249.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5c5c4603633434869597ecab072a20c9/29573426882.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161332d6515abc---xovipo.pdfIn PDF document text
    • http://saktigroup.in/uploads/55015662181.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139053caee7f---14174825541.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614317f5211e8---geximoniguxub.pdfIn PDF document text
    • https://derfo.info/resimler/files/gonadexarededanesakuzo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/8mebd5oajcf2m86lb6pku7pae4/gekaf.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/misawi.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16852 bytes
SHA-256: 8d601b3426d783e32785853bf35db0670437a731c7ab492ea02b10635c1d40b7
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 10784 bytes
SHA-256: e16de11970e4600075d16a7a088fde18bfc3ca003d7f32d064d405405dc6ba3c
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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