Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb4d595541742d4…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 09:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6844b5877effdb8ec8e6f3f3fac38096 SHA-1: fda28af7e68a71d17820d33258596b8d5de43262 SHA-256: bbb4d595541742d456efa35d2588fbf97e64211b46ca3e816162b3cffc5e1241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for phishing or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/pogimebezuxegaziwizaguba.pdf In PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/45959424719.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e7a6337741ef41633686e79b31f92f87/24836731358.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413ef978c8b---lifupezaxoled.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/pivotutarevix.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202192848589609.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/kusos.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vamenodajalizinejikuza.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/64441129185.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/51217756110.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/52907351226.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/72674213762.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/rojimakozudimenolujip.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/famedux.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147114c1594f---dajejadapibade.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/50825175762.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/95295508240.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8dec4c8477c5303acc807d1618f3c952/28355420991.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xogug.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/81092553166.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/65977933878.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/porowur.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/77838860553.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910224758.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/gimaralupinorobasofaril.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/31539788874.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/54c6dade004d6e5cc6353ee1699a5444/juzoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=project+lazarus+roblox+best+gunsPDF 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_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 10848 bytes
SHA-256: 3f92d6d27ec205a87f5f26d911778429f7afc21f4de77da489607c01b9d059bf
font_01_sfnt_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 17120 bytes
SHA-256: d3ef46e4eb5e69bdea62fe28ee9d29f9f19df406101277bd883fb7e4b414a97e
font_02_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1