Malicious PDF — malware analysis report

Static analysis result for SHA-256 455f79f7c76fc34f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 16:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 75d403c5adfe9f6f8ce46f2b36256138 SHA-1: f6962c521b27b31cd4d54250db9d53f07888e494 SHA-256: 455f79f7c76fc34f3097b31eed923301ed3640bf2a405d75e0d619670a821ffe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=worksheet+maths+class+3 PDF link annotation
    • http://www.asslar.de/downloads/telugusomuwefaxotuxituf.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/djbc02ndk2sghj4sh4k2bhutsk/sutakoviginifugo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c064b785---75400407959.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/20697165806.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/54452498661.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/fowufo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071da12af814---lozopasafedemakifamumun.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/nogusifaxilulapikelagadik.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/72575593285.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcba640123---gasapopewigiwugusepu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/34e624a75b87789e8469df38fd14556e/jezudobumifebukug.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/wuzubexabamapol.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/nusizim.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/t4sej63hm0j0n5i13uds3dn4gj/kedomusegafomela.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90511880396.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108250100105985.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/gonegetibawitepu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/41305818213.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/022872425c942b8d820f85c0a7d937df/subugijibevupojufere.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/6223419854.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/nesuzizofome.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/dofetab.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/93158421711.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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 17844 bytes
SHA-256: 3061d4064242e96930399d273f351714b2c7b8a89474fb8ff29d0e7069460704
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 10556 bytes
SHA-256: 50103e3893cfbbf6316e5e4a1f41ae0d772570f4a48fc62e5a318c58c92823e5
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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