Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d8e446b52968f8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 10:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41ae6e9be0ef29f0a25f763680b2eb02 SHA-1: 784a71d190bfe870470f2bf402f1d43f632acb0e SHA-256: 20d8e446b52968f87a1a9c1755d4ec4072b9364c6964dc4ade5ba2357c669169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://titibbs.xyz/js/ckfinder/userfiles/files/bamojufunanit.pdf
    • http://h04ydivan.ru/userfiles/file/11100331454.pdf
    • https://adikkedua.com/contents/files/rajodimaxibuliju.pdf
    • http://korsorlampang.net/user_img/files/puzolewevarodalusoref.pdf
    • https://ms2oke.com/contents/files/rizow.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/21435419422.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/zulusumor.pdf
    • https://nmg.lv/img/uploads/files/60881443959.pdf
    • http://clingac.com/d/files/61582506837.pdf
    • https://mytopics.it/uploads/file/20244201362.pdf
    • https://mantyobras.com/userfiles/file/80053067819.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347991050aa---63070007241.pdf
    • http://krukewittfarms.com/userfiles/file/19633172248.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133435357b60---gopunixovefasepogevapu.pdf
    • http://sun-green.be/ckfinder/userfiles/files/80327609618.pdf
    • http://mp-journal.com/media/file/moloboj.pdf
    • https://kawanmto.com/contents/files/77884617883.pdf
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/90742722860.pdf
    • http://inspiredindianfoundation.org/uploads/42789157059.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145472e635ac---88136482054.pdf
    • http://kieryk.pl/img/userfiles/file/robikatirogenup.pdf
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/70475278330.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/lefitelikezewaxuxitufe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=house+of+leaves+full+book+pdf
    • 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_off0000e6fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 16792 bytes
font_01_sfnt_off0000ff10.bin
b45034b35fd8de2c7e005d6c6fc2e3f3e1cde7d69fb9845563cd0658a9284664
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 17436 bytes
font_02_sfnt_off00012bf3.bin
f2509330e36ee30f1e170376fbb908a27e4d65d58150c09c1483efb9898e1a94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 10484 bytes