Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b0ddbe51629db…

MALICIOUS

PDF

112.9 KB Created: 2021-08-17 09:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e7a31d342acf31be39029011b4a44630 SHA-1: d77748a524a1817c8396d40f82d5e1312cbefbb6 SHA-256: 7c2b0ddbe51629dbfe32a9d5fbe44a818d51d86cc2d528fff5110f41cf35b07a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised WordPress uploads and other disposable hosting sites, combined with a heuristic for a visual download button, suggests a phishing or malware distribution scheme. The file's structure and embedded links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=libro+auditoria+administrativa+alfonso+amador+sotomayor+pdf PDF link annotation
    • https://hotelindigha.com/FCKeditor/file/dosutadusap.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210511095338_1267856552.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b82d4bb7f7ee8681a8dfca3b58598faf/lavamawotavituxeza.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c0a54f8bbb9088f656342ad043f0a080/74901641949.pdfIn PDF document text
    • https://digireg.es/upload/tegamuvejezufemenabexus.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/35738436487.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/892438237.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/gudetobagolipomikaz.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/22493925697.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/moronefupob.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/26e8c008ddf2a936e2fa94ecdaa2608f/xufetovorakeg.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0skds7dj627tfqquv83dcqe0bg/voforodanudukimal.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/zakadupelokedidekawubuke.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/21f3e36646872bd89b8064bb0a874766/31538572955.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/69981551594.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9femevtd88ah91jt0c40c2icp5/58616924950.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/8825766083.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///geziruzu.pdfIn PDF document text
    • http://yuha.be/_files/file/98912261791.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/36aaf6b3a96e49b1cfdb4862369587af/vinukubidixemufuw.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/wibibepevobi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/12175191624.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228472087---tokugopifokixunosuvivazib.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210627144446.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xajoz.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16272499198933.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_off00014fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDF 10904 bytes
SHA-256: 2af6a70e7badab5d8df10ba7082a0e0c968ed66a9e1771a63b46b39866468c2e
font_01_sfnt_off000168e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180FA 20256 bytes
SHA-256: b0631fe5dd306d7f536895a4fb757c787b987028ed9f335f7217a030e3930ecd

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