Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c02bb6cd9ec3abf…

MALICIOUS

PDF

80.3 KB Created: 2021-10-08 08:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7df5cc1787160ee091d9efe66bc5cbf1 SHA-1: ae5f6c9318f0c4962d576d4cacd62c7fa6a8c81e SHA-256: 9c02bb6cd9ec3abfd03dee61389c0c7854d8c75120cc42cccb53b3e185e81e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://vinhomeshaiphong.net/app/webroot/img/files/vomip.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8450c552517268264d319e2ca8e41532/11439308392.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/439084666.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/74869276072.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468289d1b83---90470860273.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/55965915429.pdfIn PDF document text
    • http://hbaoge.com/upload/files/nagomes.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/74395309632.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gpcfa5l6jai1auq15kkv2mq825/fifimegewij.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/4495276254.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/10756436144.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615f9ebc3783d---kofunogesuzepenubitelelej.pdfIn PDF document text
    • http://canadanur.com/resimler/files/bixavuvobevepa.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210917190334.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/bojuri.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/lofenimibulafuninupe.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/29058743519.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/20114767171.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/67462348486.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/wekelubizonolomi.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/58795249028.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/51944857909.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/25668649598.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/tekakupaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=widal+test+normal+report+imagePDF 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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 10728 bytes
SHA-256: 021f1fdee4c516133c2250ef11f50437ddc22704f82fab21f65ba428b5dd4a65
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 17964 bytes
SHA-256: d344603efb4540e3a6fea63d4cd5e50f0f83c65d8733b46cd550f61e84374d0c

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