Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eb053817ec5100…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 22:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5f84e2d47b9c0ead689df57e2ea5a3b SHA-1: d831e00b616583375d3c9fbe205f95063d6cfbe2 SHA-256: c4eb053817ec5100fba55a0fa14d0c1fa169de9674590ef02b36dac2d9650577
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://italianopizzeria-pg.com/uploads/files/jaxijaturewemogas.pdf
    • https://hogies.com/includes/template/uploads/file/purodegojigak.pdf
    • https://gyn-koe70.de/obrazky/file/nedarosib.pdf
    • http://0-50.ru/userfiles/file/87305504194.pdf
    • http://noithatsah.com/webroot/img/files/27665596781.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/33f419b77a50933edaf1cb6442609f9b/mafagegexujutiwetojuzita.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e89b4bc3---zudizuruxexome.pdf
    • http://modaxch.com/userfiles/files/70203931397.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613144b35f5b9---13759167994.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/lipadumuxobi.pdf
    • http://electric-kernbichler.at/99915512935.pdf
    • http://www.77ice.com/upload/files/21408740402.pdf
    • http://netmode.net/app/webroot/uploads/files/14118311758.pdf
    • http://achilleferolla.it/userfiles/files/wumafo.pdf
    • https://aqualibramontois.be/fckdownload/file/taposuvex.pdf
    • https://habibitours.net/ckfinder/userfiles/files/57509309032.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16140b2433d75a---95692612179.pdf
    • http://bulgankhangai.mn/userfiles/files/masixa.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138529c1a2c3---93876431648.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/96031183699.pdf
    • http://ingmarcofaedi.com/userfiles/files/89064998531.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/72701956883.pdf
    • https://cezartravel.hu/userfiles/file/22877586968.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=scary+teacher+3d+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c678.bin
7fdce8ff090291cc699e5a877f2f4c566d14d701875919d844409e92dc1c4cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 17008 bytes
font_01_sfnt_off0000f27b.bin
ee1f2475b5bc32e5fb217133a28fa793e4e634618e3da3a61a989eb2cc7a63f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10892 bytes
font_02_sfnt_off00010bc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16792 bytes