Malicious PDF — malware analysis report

Static analysis result for SHA-256 045380c186e60261…

MALICIOUS

PDF

98.0 KB Created: 2021-09-03 19:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed332a5de40dffb0a1b678642a613ec7 SHA-1: 7d57300d52288eb3b6fb6fe6ce2280a85e27b487 SHA-256: 045380c186e602618e7657a2cb088f86da28930f5d921b4e5fd19495e3c9f3a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights links to compromised WordPress upload storage, suggesting a method for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wu-pao.com/upfiles/editor/files/lojizalikovezemenubosif.pdf In PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/82939502495.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/96126970548.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/dukexojelibusedege.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/molokewazejifilofo.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/sudedagosunowuvan.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/tewiralimulajunemilisezi.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/wudisitavigogufupodefu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/chiv95km6evbh0ei7su4c6rchf/safev.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6540141efd---sevulepubirebe.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/giniwipikivupifetasewon.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t7dlod9s7qth521ki2dfeoqaa1/xewekifusosowe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81ec99fdba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/87812042043.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0dacc779f55cc9d85f51c56da998895e/1471754896.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/gopubar.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/86117678347.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/vutiwowiwotezojis.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/pukopuzelelajozok.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/sekigilolitovofozazeb.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///39596638776.pdfIn PDF document text
    • http://proart.by/media/file/nufavef.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/tiliremutabinoxawoga.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/38399637742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=surah+pendek+juz+30+pdfPDF 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_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 24704 bytes
SHA-256: b8adf5fedd5b0c01abec2304fd31f75c39a751597bb0026f4fce58a1cb47f4c0
font_01_sfnt_off00014912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16129 10820 bytes
SHA-256: bf77f4ab8dc2919945d38be6888a5ee36299c3d60cbe27a97d2c5a0f34d23a19

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