Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32593aebabcec77…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 08:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cee5e9a7bca1c9428b3e6a7c23d5948 SHA-1: 9f82642deb1e6157675a7cdcc553967f444b5db4 SHA-256: b32593aebabcec776dc6b96437de962058e316eec4525ad3e7132a0bf7ac3d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=websdr+app+android PDF link annotation
    • http://quesnelbusinessnetwork.ca/userfiles/file/karofekokelalumutixorodat.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/99268325749.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/difemivutibenibazu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba774099f---22560552615.pdfIn PDF document text
    • http://klinok-saintp.ru/files/27158905162.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/26414716413.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/1610655142.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/biwofa.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gotaxavera.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/pomuluvija.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8015c422---nakenijukaxiden.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/11339927569.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/40101598291.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85610257388.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/famadibuveguxuromugafun.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/rilawav.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/vevovomidajosavogawiwez.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/mapilufo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/13679801011.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/21345660727.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vulunawube.pdfIn PDF document text
    • http://renknh.com/ckupload/files/wewijekobivitole.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/27772129049.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kodowutadawikejasatel.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161353cc08dad9---varumodizapabanafoluvetox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 17452 bytes
SHA-256: d6ca0f51c21fc7f35a0000270a7b800e5ac896035887f7e2bfa17c6f06eee8b7
font_01_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 10372 bytes
SHA-256: b8e60047e6cef7c602f387ea69f86da48aa8628ec55b1bb4d558a59938678be8

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