Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cdcb557a017e00…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a1c5fae9300585806230fd1dd3264ef SHA-1: f5ad4cbabc853a6fd00d8bac51e55d2103119e36 SHA-256: 18cdcb557a017e00c8ed5698f7c4bff83ff778d46519a3b18aa4b31c5bfb6030
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the heuristics and URLs clearly point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://santchavarabed.in/ckfinder/userfiles/files/nimofilav.pdf In PDF document text
    • http://shs1977reunion.com/clients/41590/File/25191732589.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e491883f---xurobifodimatazijamuvema.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c8507ae1---duferiperakokokonex.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/71812998735.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/30471958363.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeziz.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/aa6c0ae808def9be33d540247d846f54/numenukerak.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/36d6f2325ed5ac8193309d6d1bd81640/ruguvuxumifozub.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d94a776e970---gevokudonoluto.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tokusaleloxew.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b23bad8311136d712825e90613988c17/zetatebosog.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/93356965587.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/94887385937.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6624c1eb9d---vilivesupamuzosawuluv.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/fuvuf.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9k8cj1rafcii82uq0sblbi9nuv/rubulumugul.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r48pc164sjdtu4ejo9q29o1v5p/38551599108.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/katenomow.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/50512714611.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/23526374687.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/78457899483.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/75773822860.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/livekasapipo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7869ca868---23596741515.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/56091709107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=general+english+pdf+notesPDF link annotation
    • 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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 17140 bytes
SHA-256: 086a0bfafa1d2ae0111cafa5595ba1454b8c405ac83e7a92e33142032c893ff8
font_01_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 10816 bytes
SHA-256: a65afd8a7589fa5584596a64c39d1d2c44787ad1f0271f0fec56b1bba661e5ff

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