Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b5b2a481c4d95b…

MALICIOUS

PDF

79.0 KB Created: 2021-07-17 02:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b1dbadd3e8f3653cc538a480710e136 SHA-1: 28e217b076bb52b99697b0140226e2080c88b376 SHA-256: 28b5b2a481c4d95b2c9f2d95b7134fdbcaeddda2f0823049ee7cb475efa4fb0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec9dd7014ce83bda8c3504a9dfc7981d/zesal.pdf In PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/nikazoganaloda.pdfIn PDF document text
    • http://sns.hu/_user/file/52917260072.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/dafejumalutak.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/pekojogogas.pdfIn PDF document text
    • http://biosite.ru/images/news/file/40277767157.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4385c9173e6c8cc78656fa8496b3ab3b/niwibaxu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b639443f008fe463174d25ac0a23d82/24935868658.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/89918179381.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2ea6484f---15704119313.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d183773bce2b2cdc84193f237da81902/89477735566.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/19865131318.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b351010cd0c---26680718656.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9duf39sbei6l6felrjbm7eskm6/vudejolopesasabufunaraxud.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/10559354535.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8daf696856---67103957206.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vowunedajubu.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/modalotazizexoser.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6294296fc---33149766716.pdfIn PDF document text
    • http://texmet.pl/userimages/file/1632935911.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/2145030803.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/39535741933.pdfIn PDF document text
    • http://muszempilla.com/files/file/61089144739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hooked+on+a+feeling+without+ooga+chakaPDF 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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 10756 bytes
SHA-256: 6ed49692f6ead3814ee191525cc4ee0d68ec922694b8f6ca1efb1bd84d7d4bd4
font_01_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 18708 bytes
SHA-256: 6301dfab0d5727f08e483d151cdb30b2b82c7deb099a0a0d1a5f258518d63c4c

Open this report in the interactive analyzer, or submit your own file for analysis.