Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfae6da4c01e397…

MALICIOUS

PDF

91.2 KB Created: 2021-09-15 16:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da1abc9b517fb46dbfcd71bfcd2df0f1 SHA-1: 28bee459f2abe5f4714af6757fc4786bd487f694 SHA-256: 1dfae6da4c01e3977b3dd1a34ffad754ed0a166d83f7b349e93b1360f2930b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish for credentials. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests potential for more complex malicious actions if the document were to be processed by a vulnerable viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=canadian+credit+card+generator PDF link annotation
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902190823768464.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e9b8d45974f846dae2d0694b4d9b95bf/89440706699.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b7da3925904903446fee16e320ffe8b0/43577498974.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161386bf5ddf6a---pefeloziponefakoju.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/mosogokixabesubuduv.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/femolopifepuduvidofuji.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/punuja.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/94722211868.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/70687044619.pdfIn PDF document text
    • https://anakmeong.com/contents/files/wezugig.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/79036812275.pdfIn PDF document text
    • http://corkpotters.com/images/mokamiwalolubawozoregaz.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/sezulavasakudegex.pdfIn PDF document text
    • http://mgrima.com/files/file/kekuk.pdfIn PDF document text
    • http://philipsphotographystudio.com/gilojaginupabironu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/lupakasejugu.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/mofidazaxamapomiwag.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec463cbe7a---pawuzux.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/91782074863.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeec3806c2---zowugekire.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/19299207353.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nokele.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/niwuzawiwilonipavumo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0b2918ba---gorikag.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/60319830391.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_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10360 bytes
SHA-256: 1520ba49a1de1d90a7d7b4187ca9abf93bb89006a286e3da7ec4a5c08eac4f86
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 18776 bytes
SHA-256: cb6ab2b9291a76411a5e25d09ab8c18427a1c5b6ee3825ff31ce937773f9cfe3
font_02_sfnt_off00014731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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