Malicious PDF — malware analysis report

Static analysis result for SHA-256 db42100b38cec949…

MALICIOUS

PDF

77.5 KB Created: 2021-06-28 13:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0eed4da43eee7101ce1c9fd7d899e983 SHA-1: eadda359e8e54a85933777656fb05a5c0b34224b SHA-256: db42100b38cec9490285e5f5a55de96482bf385205c2727c1ec96508dc41930c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=decode+base64+to+image+javascript
    • https://tecnibat.net/uploads/archivos/rogigawugibejuxow.pdf
    • http://www.contectrade.hu/fckfiles/file/dutivijozowotisafosi.pdf
    • http://getem.plfiles/file/tafadowanazaledez.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0cafc146bbddf0a34a1ef97ac15b352b/97155920615.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/84fc01ffbf71edeff71fcf7a1d277dfe/22936876423.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c493600028---62123680511.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a0ec0bef---46926956359.pdf
    • http://baraanduliaptti.org/userfiles/file/desowuvasuvimajinosegowa.pdf
    • http://jlm-kg.com/uploads/file/28851319347.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7bc4e64f29a3f2a1c2eff8a9e00df092/bivututimogugupozolukeb.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473bd6dfb5---tewopafitogen.pdf
    • http://scheidenschiedam.nl/uploads//file/lobif.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/taliwasumegelitonat.pdf
    • http://mai-colle.jp/userfiles/file/93671696808.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/717e280ac50db16a9a9b2ce910f48a78/wikufegakowenukakulusetud.pdf
    • http://uci.ir/userfiles/file/49717738575.pdf
    • http://tycoonmedical.com/userfiles/file/87206611990.pdf
    • http://i-harmonics.com/upload/files/67999424865.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6379aca8bd---28112578864.pdf
    • http://vivatbacchus.hu/files/file/89562958427.pdf
    • https://abeess.com/userfiles/file/99352086570.pdf
    • https://aawyx.com/sites/default/imageuser/file/javasorajojetodas.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8ed063a4---robiworewe.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/pegadexutibobobibamobezi.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_off0000c881.bin
194a9bfa808d0ad186a1642b785868395382e34400f2620e20538a7a36bccfd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 11292 bytes
font_01_sfnt_off0000e2b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 16792 bytes
font_02_sfnt_off0000fac2.bin
3af6334b38b0f5f984dd04641d45f17d48e790c472fd1495547fc9b2e56e833a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 17352 bytes