Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ee82ec171f4838…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 21:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f3f6b2e346be5a29b770fa2d5eab92c SHA-1: 9df6ad0eb9cdc42f638a2d770728a0fa544bb6b5 SHA-256: 89ee82ec171f4838e1f28f0afdfbdf1c69f48f8801a97875d1fe42a18883b704
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://locthanhwindow.com/img_duhoc/files/26257154861.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/36186090039.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/wadezegololikiruwugin.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/nafigafebus.pdfIn PDF document text
    • https://waroproject.com/file/pewivatijugetitovu.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/87634765548.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/4012853059.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08ad1b8c7d---kefuxaxoguwibesut.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/vejazobedibotitudut.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/87024631028.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fd8r4e581lq9huqcpt6mr64j73/vapujefozunapuku.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/povafufi.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/50002606799.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/vizojosu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d059611fea4fba88043014dde84216a0/xokopujefizovada.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6ca73f42d4afcf1aabc72af6d937c598/xuvojamagutaworubiwuxi.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/69796374587.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/68847459144.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/25276100175.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7f4cdb3899fc2b83b5d69554573e817c/poparumorudelirag.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/disagererowugolera.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/085lrgij37m5qk89hd7vkp37c3/kupixususat.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/63944635844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ignou+solved+assignment+free+download+2018-19+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_off0000be8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 11748 bytes
SHA-256: 2f458054208e9aca9ed62cbdc2250c6221ecc0d1b9270e043b2d7e7321d9a752
font_02_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 17400 bytes
SHA-256: 180f4f926747f7f45bfd26f302186470becbc4f0ee54bd6f41b7b6de818e63c4

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