Malicious PDF — malware analysis report

Static analysis result for SHA-256 1549d6ccab00e1e1…

MALICIOUS

PDF

88.1 KB Created: 2021-07-17 06:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: beb2b5deab7cf2937ad734323d631f97 SHA-1: 69a6c03a64fed8fc9cd83121b635275cd8f54202 SHA-256: 1549d6ccab00e1e1e17878038daf45c58bb82d6a21099e12ec78f5d87398863e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fe8446f47f9f1837a0ebab83f9d7163f/fuladesutoxokig.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a809a8686---17126147481.pdfIn PDF document text
    • https://masukpt1.com/contents//files/rixutuwumomenojabuzeti.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c757e323f---86341436330.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ptmuafcojoqq7g4un2cucpokle/volifefol.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088822015c31---pebujod.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efdf4b44c---tugapuxexilotirob.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d4015318eb9411906d2e1cea753d0073/53226412126.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9fab722b73bb296f2a187cfead7b6178/1166505547.pdfIn PDF document text
    • http://emannsltd.com/userfiles/4601211387.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d0f144838ce6443aaa8909a596836b23/finabenumujo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/56555835086.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1764f1c89012137bb81dac868a5879ce/selosabesanaw.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/20803133731.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/23510886868.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/redorutisalozekurivabinuz.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ona9vkl160rtv5gkf35lh1hb40/rebokanofuwubuwujekejan.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/diviju.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/k613nfo4aq7boigbnfonmm1smq/60071285558.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lkmu8daa84qb0icctrtvkvc8cv/magunura.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/44306850276.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107161836256567.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zedutifawunuraxarunojuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nora+roberts+books+online+readPDF 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_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 17144 bytes
SHA-256: 7ba1157053bef825621d81fd1de78203631c457a17362d3682d8113fa3eedf62
font_02_sfnt_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 10448 bytes
SHA-256: 9c2acd64f421bbbcc98d0424b008acb04260a07eae19bd8a0ddb0e0b5cb61f86

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