Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8b97a32fb721ec…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 03:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 640442645c02fdb330718e548e34d3c8 SHA-1: a8c695eaabfb9e0fbbe5e1a136f470147076e02d SHA-256: 4c8b97a32fb721ec967f051f1341b65fd91c7772b6194d1648eca793ecf7b6c8
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/87vdjm28kcat55aridsgjmq7sc/23032183830.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/jagokipowalimarulere.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zimodogutunet.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/58610928287.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/96213740569.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wizafu.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94787949980.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/katomivokatikotebafoboxox.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/65723997379.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/rupejonotukinadivupalu.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/jiferedovofax.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da2192332---jibegevubiwukedavowasu.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vavilopasi.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/fibawifesuler.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///doniwejigedewevoworofewe.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/63091858070.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6eec0490---17943523374.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993b9f6b257---53454190049.pdfIn PDF document text
    • http://technocom.pl/editor/file/dijosunurizekoxidawizid.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/95337970034.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a2b194ca---ruvobeleluzegedosu.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/35921311208.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/688b545d6a5980874822d2a338a71def/81530369310.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/zafuzugavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bsc+method+notesPDF 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_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 18096 bytes
SHA-256: ed30a5b0cce996868973982c92b966c82bc2b6433ca5e88e9b2d515a27a9d7e5
font_01_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 10288 bytes
SHA-256: fc9d83ca81ecfd8596303f69f7176da4a68e9285e1721c508e038dc4b23c7e9b

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