Malicious PDF — malware analysis report

Static analysis result for SHA-256 133a25a51b2cc200…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 18:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1bda475e8581131de7180bfffc7b86c SHA-1: a8430cbebaa449e795502970ece2870b55b61ef8 SHA-256: 133a25a51b2cc200d245761acee911694d148228566d4942a00cb93f4bffe7fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML heuristics confirm this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82f4ead97---bopodupogapopa.pdf In PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/dudexiwepavoduvoz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f6ad7a2e---zopezonomunokuwavipawe.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/kipapowizikunipapoji.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/diveriwanoxalegixoxagun.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160871a72e514b---44010603009.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/14687923607.pdfIn PDF document text
    • https://la-klamm.org/Files/files/labejezarasozonewevumafoj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5e2bae9a8350ca045d4fea0ca5a9dfc5/80959464096.pdfIn PDF document text
    • http://amandamaitland.com/images/file/rurinosogoxixi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/991e8f26da5ddf644f06b1f3083feb92/57730374417.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/82904477629.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gh67ud1i99llj4bj7geqd8n66r/pufugimabitowokazuzezek.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/zozifadizuzepu.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/73762762985.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/86151212201.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/xumuma.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/31352213788.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/kibevarixofagukava.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/3810558299.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a3d9844d---lavobapobin.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/58612529182.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/27883755861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rct+study+design+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_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 16944 bytes
SHA-256: 063d7bcaca5635b8d123a226ad3b7f0a6d0c17da80f49d34976e92bd5b607bb8
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 10624 bytes
SHA-256: 6202be93021e9e9a02b1476eec1fd14d12887119adcb3834ffd4f04168eb7076
font_02_sfnt_off00012214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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