Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6296af263ec86e0…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 13:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66c03e361c5770fbc5f1e44421065a24 SHA-1: 22089436fa71429920bd1b45f7d0dc392237b64e SHA-256: b6296af263ec86e08b7c8021b3328696d358e5ab8cdc918dd4bc4bedb185e8bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=hate+love+quotes+in+english PDF link annotation
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/matuposagasobapibe.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/abd8b47f3d6848600f261220dee6cbe7/22242738426.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a0ac5e24---98669062342.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/30482766440.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/seginoritunivuvedozaz.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/80345677536.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/padiwalefiwofi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/lujuwojonirusajogegewor.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/duwunumelu.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/xukasedur.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/rewatutejurakidowomos.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/tejofolus.pdfIn PDF document text
    • http://air-con.ru/upload/files/safapujowikegumenikadapu.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/xususef.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/34932355643.pdfIn PDF document text
    • http://pabxlg.com/userfiles/file/16582847047.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tulonufobi.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/8305183340.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/82388441832.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/remofikefapefupigeba.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/779a293a45d16505202ed37e8bdf065d/8363822547.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/lisisejuwalogowisarofute.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/27584340845.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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 16612 bytes
SHA-256: fb193a3a820db79e1b2bfcfefda419887b4a32b01f12fdca5504c965ae6bdbaf
font_01_sfnt_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10592 bytes
SHA-256: 71b0b3eaafd711aef9a183913b240af73ae83ad698052022dbe091cb93a41ecc
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1