Malicious PDF — malware analysis report

Static analysis result for SHA-256 792f57047814623f…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 00:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc711c3c4473c0d4b4605872a1db78e6 SHA-1: b754c0655e4a9cb0f27eab22b574aa5c3cdc3da0 SHA-256: 792f57047814623fcb8fb9f9170f6afc4146d45dcafe0997232f5663160fcd9b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/medikulojadipositabuzu.pdf In PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bemifanowapabudo.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e0d71231f90cc3080be8b8205bb8458c/54125857867.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bomibezijazojinoxobigat.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/53502047336.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/bb482d850bec90089e672f22440d4367/8666622868.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b18a2afc---wamiruvomesosun.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5cac634393b723b442216d85018cd861/jivizawarero.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/giqm4c60mbm5hme2jdu7hh5nf7/vunoxe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/orhq1k350tnr3b7gek3itg4p3f/97746241711.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6alb87ed8akp0v538bua1r8565/xakanufaxelozidal.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af752467717---69816065372.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090c063f1506---24133451438.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929105c3a71---pojukibemidapalawazi.pdfIn PDF document text
    • https://digireg.org/upload/34233089136.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a585346c---bagujixametusasumabatal.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42a476908---66555263129.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/sinesubuvekikalomisojad.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e8ab970e0975acaa29560ae1f8a158e/bodagi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/17c87c533f8395138b2685c6316f9050/nexubodunido.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9f504038---bokijudid.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/wizipurabemeba.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5c7e22595b1a14feb8e9b276c031cf7b/75577754911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=english+class+9+deleted+syllabusPDF 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_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 17272 bytes
SHA-256: a0c6d7871d47fb1d25857befab4b48f3b4fe681baed2a980b0f2e75c0d0923e7
font_01_sfnt_off00012e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 10936 bytes
SHA-256: 737c48769f0b50821709613013e7642474abd89c44f82dd4feadcb4587de9e1e
font_02_sfnt_off0001478c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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