Malicious PDF — malware analysis report

Static analysis result for SHA-256 444691488ef0e1a4…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 07:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: baf7d953f9c66fe727aa01d5c75607ba SHA-1: f41263d5fcc1d6bba871f5cc9fe2b2202f4d46bc SHA-256: 444691488ef0e1a478af638b233086a7dfce548282a900ed6fa0fdf9e9f8e9e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and potentially malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect the user to external sites, likely for phishing or to download further malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=how+to+check+the+checkbox+in+word PDF link annotation
    • https://ph2020.org/FCKeditor/file/tejidijuvilozovaw.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0e63f7cf96f3846fb527b719c0f77c6a/jekifobosexesiwipesiwolo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fe78fcac---zogepinazitujapokopoti.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b502cc57---92510341485.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/meluwixadituwinejizomaku.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/lerilolu.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/parijofosifuru.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/84416827899.pdfIn PDF document text
    • https://argumentua.com/i/file/23691069641.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v906kc4k40q0un7l76efpdsqnu/livaladugagiwizulof.pdfIn PDF document text
    • https://wagaskar.com/media/bebuzip.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/kosoleluwevejevaj.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/loxuluzevuwubarig.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/02/texagekagiluladebo.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vofodunilekozinopuselalux.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mavibovemuputekalokidivux.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/1812410130.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/83514376522.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3119abe1---25314371764.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb572a24d5---deroxaporirizudupuparas.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20d077f829---81830117406.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/37127338036.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607413248b706---dukoliw.pdfIn PDF document text
    • http://gerocuki.hu/user/file/moxawan.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8bc2d9956---96208215945.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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 16852 bytes
SHA-256: 48519b1d6d58297245ed97ad8ff21c92e523831a78cb7d9e7711cf30d8a1da35
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10504 bytes
SHA-256: b85ef0825f970d4562cf31ececeffc523b746cb54350fc8e27900f7873f529e1

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