Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7fa5e55c8f60c0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68d6a470ac63817db026b149d2b78ef9 SHA-1: fcbe38c20113abfe6f9789ee05bda1d3ac435a72 SHA-256: cc7fa5e55c8f60c08ced26d31dbdecb17ea3200f6000d9f6df679ef46b98c732
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://handinhand-daycare.com/ckfinder/userfiles/files/12984262202.pdf
    • http://vinhthuan.com/upload/files/bogilomifasifovasa.pdf
    • http://dkkarsin.pl/img/upload/files/33759493329.pdf
    • http://kaizousha.com/js/upload/files/26354656162.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8dl1vi82pq6h0h18c0ggc834t1/25709458782.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/23353522.pdf
    • https://marathonblainville.com/userfiles/files/54883949765.pdf
    • http://fiumevivo.it/userfiles/files/8058875174.pdf
    • http://preiss.at/upload_files/files/xivinukadebow.pdf
    • http://ateliergermain.net/sites/default/files/file/sidimaveki.pdf
    • https://heuresromantiques.com/upload/files/72275823035.pdf
    • http://stroytehcentr.ru/images/file/97089657484.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gpp93gu0qlht6eu28mtmvmf864/59320741651.pdf
    • http://abwingsde.com/uploads/files/buxerazamora.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/72702382088.pdf
    • http://sarkar.ie/userfiles/file/39646293517.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/03798ad0b30a08671942fbea3c0f3598/teguzago.pdf
    • https://ibextrail.com/editor-images/54502189949.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/35889929930.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/ferujekifaw.pdf
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/79991718733.pdf
    • http://karlsbach.de/userfiles/files/72735166754.pdf
    • http://yeongwonenc.com/userfiles/file/81276116702.pdf
    • http://jump360.co/upload/files/20210918112406.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/85024775217.pdf
    • https://kotata-zlin.cz/obr/clanky/file/zemito.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=welcome+zindagi+marathi+movie+download+720p+bluray
    • 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_off0000c274.bin
4b2abb9f2b7c3d31252b89bed511628a430b45dbf7e085673abd771dca2cd710
pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 17980 bytes
font_01_sfnt_off0000f154.bin
3dab4c8f27f32a5c7caf30e9db3d383fda6ef5b4a76d344c9dc1d82472a511a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 11644 bytes
font_02_sfnt_off00010c89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes