Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d389f74799693e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25b40874aa72f10607e38e298688bc49 SHA-1: 3718882a3921d4768d8825399681e1aacb76628f SHA-256: 28d389f74799693eac5a5911f02733482e9c8ba4e9496508ec0a790eca8291af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress uploads and disposable hosting, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=university+physics+12th+edition+young+and+freedman+pdf PDF link annotation
    • http://hacoauto.vn/upload/files/1799903666.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/76021591691.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16102fa0dad5a8---pajotibivadularutu.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/62255697218.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210827022749.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9h5qa3d4r2jd2jt24jhh0grvc4/mugunokusekaxavazipedakid.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/345a7d239c2de932e87884f9de907856/wumuziziwaxotefezenopara.pdfIn PDF document text
    • https://kede.org/userfiles/file/44490379914.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/13fec45297476451bb04a79a6b52b9f4/guwoxoxir.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e7adc6703673facbec5cc3298ee1012d/78216038024.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/83162485564.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/92405883902.pdfIn PDF document text
    • http://dentistturkey.com/image/files/39792003508.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/63665814359.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95acbc1c79---mimananagutu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p7p96j2vu5r2spqlgoi1i77k64/xowajavizadavinaxuvufapik.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104edc75a883---55260156980.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8004f9bc151a710da7a3917e07b1296a/fisoxememuzamuzobep.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7mp2ncijg8iej5jce4ildf1g45/legarobazewinefejom.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/84ae0e887157875ba311fcc646a3d3a8/kegetiteforoz.pdfIn PDF document text
    • http://mobilenmr.com/files/files/puwosomuwuxo.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/73330331417.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/tepin.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca640460b---31647310360.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a837fc2d7d---mogugolofimome.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_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 17736 bytes
SHA-256: 44feb59f76ab6f66ce3eff0eba71d2ed2533272c0c576eee9e5a7180ce1057ac
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 11480 bytes
SHA-256: 9de44e883fbde49c042582451c96d5c7bdd667ef2f92cfcb8697b10545fb06cb

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