Malicious PDF — malware analysis report

Static analysis result for SHA-256 477f1253fe93cc00…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 08:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28690a2271c8ec0409f8e27ec696a804 SHA-1: 3d79a724b72afdec41b58565c4c8515210b6594c SHA-256: 477f1253fe93cc000f0e0ede85962f50c7f47fcdc19d16c254cb7768c848b531
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 websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://myxroad.net/upload/userfiles/file///77920031350.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897986a55dd---63274027179.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b57c8ea965d4c8f9fd1545aa5d29a318/nejonuwadesirelapaka.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xazanerut.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/kakaminifiwipo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/28221962005.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210604/2106042131321289060zgk0n3w36z9.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/detivelomewurorumif.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/25773595866.pdfIn PDF document text
    • https://combrooncom.com/contents/files/39729331113.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8198449305.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/70361673915.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/kerijovebofitali.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/nigukitelivukimeruko.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/biwasinud.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/bezadogojuboworukoz.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/mizupipiretupenarapivuk.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f3d822d14---23774788509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=year+1+worksheets+phonicsPDF 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_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 10636 bytes
SHA-256: 8ade6da854bd934ec463bb58bc7bd2e952c036da205d9e374160d75e5df2a033
font_02_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 17488 bytes
SHA-256: 355b62d982b2626522de8383f8c2d5316db87cb76ea19391cd87efdeea9fe2ca