Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c32fa0113913da…

MALICIOUS

PDF

111.2 KB Created: 2021-09-05 01:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c22b20d98cf1d02133df9dff1714e80d SHA-1: 9b603b0d17902d9dcc3978891f2ae07a7d83a69c SHA-256: b8c32fa0113913dae6ab96288b05314222659b502e31c08e0c88824820cc5d23
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ccbdgrpumfqnl6eu77u54gjp41/jevurakukiretane.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/95981747982.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2af07473bbde81393f2b2d739c3c1cfa/sozurozi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/55942472317.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a05374dca16910ad202ae5385fe9b974/pazazotigurazuxo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gidajofosedorikeriwuz.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/a46d890aabe4a981dd8e23e13220daaf/2745024606.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/naramofonubudare.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/80060982809.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc252a8e063---zesapupa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/927445746724fe92cedbdfccaa9261b5/japajab.pdfIn PDF document text
    • https://coevent.ru/upload/files/46713002956.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/79015930771.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075688b80020---gumoteri.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/38938229895.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62528f2d09---46560022329.pdfIn PDF document text
    • https://hgb.se/filer/file/28182870013.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/gimupuwivuwepawi.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210819085758412.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b7cccbd78afbeaa6e6bc37858a6df06d/89676195516.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/e9ug920um388kebo7gi5dfks55/fumonevisa.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/nonabowamobiduzar.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6tlb37ggsct7nv7bq0ccp7sef3/ziwirefa.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e39059d99f7fd026722d2580cd2add55/gexatizirajonaras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=netis+e1%2B+manuale+italianoPDF 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_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FC 17940 bytes
SHA-256: 62eb46a1fd39f9b53cbdd6caebf97bd117666a94da49eea626ee755ff23ceba0
font_02_sfnt_off00015e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E27 21436 bytes
SHA-256: 40cfda4ec341922ddf66b72b771dfeac9540dc541f4865fa7f092fd843381728
font_03_sfnt_off000196aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196AA 10300 bytes
SHA-256: 1c3920118d30de07e8895ed0d2ab1cc976dcf394572ae4cb0c4f4455eac5f4bf

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