Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a5b75f6e72e582…

MALICIOUS

PDF

102.7 KB Created: 2021-07-09 02:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db823127f5d7a0233b1c0ffef684a298 SHA-1: 3657e3e289cdac1acdfe5ef4821c0c7b74dbc81f SHA-256: 52a5b75f6e72e5821c3967dbdc974c4b9b5a4ceec9ba10fe227a06c4da5962c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern leveraging external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a71e38f9---kewodinijipedozojufufu.pdf In PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/vj3qi57g3bhb889dv5j29rpnc3/polukinebisekivobitur.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/wujojijeboxozofexomizafuz.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/91388465836.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7a691c9c6542436cf395c4d8afba626/82734083283.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/piraloj.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/haavhic4uftn2c1vhqij1lk427/fotepijedajotozabo.pdfIn PDF document text
    • https://promise-land.com/upload/file/fufobovo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uld8bc5sibpcdjjt2om493o03a/kotazerogujizefunirolevak.pdfIn PDF document text
    • https://kopari.hu/files/file/10731175430.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4eedf8a5e749a872cd25f3eff2f6be25/19656379580.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160820d016a55d---81303680301.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/39dc2b9b3996da4fb96d020c17393279/xesuwip.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f210dc131c---49635215385.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/kosojasudaxobireget.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f205245f79---13415999593.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0bbe83ca---93852855767.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/66416275412.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609698ecd0c3f---71638600678.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa2a36be1---ferif.pdfIn PDF document text
    • http://qca.ch/userfiles/file/64799942633.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d28c29440---wogogebek.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/18231660060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=happy+birthday+song+with+name+in+malayalam+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 11276 bytes
SHA-256: 7e1f496602967635f7cb4a1f66656d5cab0c5ab635111bd2ed5f8a602aa320c0
font_01_sfnt_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 18316 bytes
SHA-256: 8ff3cd651e9fa22af668f67586f02d8dcba112f4e2b504d13c71e5a8f59cb81d
font_02_sfnt_off00016a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18288 2232 bytes
SHA-256: bad989b9af5196a00ef532d9f0ff3f7d4829e43e48f2ef8c51e3ea827633e785

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