Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e37a3b5b6d28d6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 05:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c180184b4c7879962a2a0aecf208d7a SHA-1: a3789b3d97279166b6e265fca4aae86c7d43e579 SHA-256: 59e37a3b5b6d28d6ca1c06f11b2ab9e40eba061b394ec7cc89809ff7902f10e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=baby+trend+triple+stroller+manual PDF link annotation
    • http://goodwill.pl/userfiles/file/12107869156.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/lejumuzusilanimuwivolu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/39604352526.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b8e6734b---pubixijenilepiduzobugedix.pdfIn PDF document text
    • http://www.emailposte.com/pictures/5935366593.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/beqdil5ooqes7ogh55ocsjmbb4/jikezoramaladizop.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aeun04f34ivdm5bgl3lvmtmt6a/senekegujigonimenaxokejof.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/43347968675.pdfIn PDF document text
    • https://jurad.eu/files/file/98275656457.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202172173373956.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/zeluwa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baec056b58c---gukibobikefi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/99922222109.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/53319325891.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/69427729060.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b54844f4e2---zaxodevabupe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607108a568b21---5503509631.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g24r6c6g779dojofuf1hhk0ke1/74114931454.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/92045673529.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4a7i81j4nfnu7ev948avbhm84a/wipowibaze.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c219d10a82f---72179122840.pdfIn PDF document text
    • https://koratspring.com/upload/file/28866828761.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/nuvasuwuwupoguluninako.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/480093c9278ea03d20541489f990846e/lanitofurenemovopura.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/legowofumumekawopuji.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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 18316 bytes
SHA-256: c21a4c9d3dc9ec89a6fc4c8df42f71b9fc2676697483a248ff712950db0742d5
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 10960 bytes
SHA-256: badaf6334a371d0784048e9829d4b559184e83f2b0705c4f3e1e76055e68a0a8
font_02_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1