Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4ae2acad634c6f…

MALICIOUS

PDF

92.3 KB Created: 2021-08-12 13:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31afcd6b09666bb2f2dc66a6c0227c12 SHA-1: 63351d8f6baa217e3d936ea0e3e18dc87a5cd8f0 SHA-256: 3a4ae2acad634c6fa39e2a2c226279d0907e84e27ef47cbe14f1f0d929061ff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://catamma.ru/uplcv?utm_term=pixel+gun+3d+fps+shooter+apk PDF link annotation
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/mm5nhohptijf0pe8eifag2t5bo/ketujowe.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/56685806085.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbadf9b02e5---pejufugutudejax.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43796336184.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/53508288912.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/78957544783.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/88793336671.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/62862962140.pdfIn PDF document text
    • https://aashianarealty.com/file/waruvetefenavodu.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/xowapi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160973b606cf6c---12826505244.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b1c7da4b69e000f572054e2f48dc7caf/57773711663.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62b8e0636---wixivodan.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43c74a0ce5---kimofawapuda.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/javobokoketurumawurujotob.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b98169c6---sojidugewekavezamidira.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/didonere.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/53866590000.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f38ef06a---45287634928.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pufapajudirudakuj.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/biterawizibabemalefaw.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b3f9d01984e227ee916e3961815f61bd/64095854715.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16208 bytes
SHA-256: 4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 18980 bytes
SHA-256: d217408d0e07b4d6f2de57a91de9942c7c3c6b98b70b7bde2458e60fcd4b86fb
font_03_sfnt_off00014697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14697 11244 bytes
SHA-256: 1cdfb59c283ec08bb8a07d579ab78bffe7b6367b454900fd3e4e5016a7326a19

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