Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05bff28e4e60735…

MALICIOUS

PDF

78.5 KB Created: 2021-08-28 21:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cda15a07367b3f5ff385ebc8140d816 SHA-1: 832b9e1eb8a8156f0b12e901926b1e5905783f8a SHA-256: f05bff28e4e60735ba85fe1de24169db4e9da9dfcf76f07020496b345b82db1e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely to host further malicious content or phishing pages. The presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7bf727e639719882004d016caee68821/16511876440.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/fatemazimazexibararav.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c128b0c7b93---jefimowawi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/faveremuwajezivakunen.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5aeff99d1a5219efad835d0c6e33aab7/14317242257.pdfIn PDF document text
    • https://protrialse.eu/files/files/jewibikarafukol.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xarokuxowatujerilijakesu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b106fac39b---momatelumo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dc1b4f54---41619038082.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ehji9jr0tlevq0as32djalbggp/21157641712.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/923635f77c470ffe211c54cac0649f24/worunoz.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/53083552123.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/retodilis.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210714134358.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/5715246096.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb619c293---sutafuvasuvimapafu.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/76182581353.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/78830247881.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/44338343454.pdfIn PDF document text
    • http://pk.mo/userfiles/file/74364058520.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kowanexuko.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vububotokapimatutokemoje.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/2124658305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lessee+meaning+in+englishPDF 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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 17824 bytes
SHA-256: 05812e67bb6abeb3c5d3da2ee3d13d9dbc0e3935d256cec780e957eb18642187
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 10196 bytes
SHA-256: b2bb80219e831584f6339951fed608740590c6b39a6f2821107c2efbd4a13a42

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