Malicious PDF — malware analysis report

Static analysis result for SHA-256 8596e28bf4ee42fb…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 13:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56b41871b2e98680098de2292de9a885 SHA-1: 99405d94048ed09383de31b5fedf8b683d1a635f SHA-256: 8596e28bf4ee42fb16d9cbd8a12fc34329fe3014a9fe2a8289b92376ecc62b5a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdfbd7ce5---mewojajijejud.pdf In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-6/20210706094725775464.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac2c82419---dulesapoto.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/56051090710.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gegarola.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/dewawomuroku.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/mafusirumenakewe.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/famekovenowimikirupudavol.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902d88182dd---43722290421.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/17901444512.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7a475d34---68036119216.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xoxor.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/56895735780.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///8837470407.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8438be5bd0---pajifilu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcff86ec6f---93424314688.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2161c0f2b7---49109251996.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00d866b225---lelolipuraforerotulo.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/95b4a10dceab4e6ba86b7f1d509f7e45/fetigefetepegazod.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/namawukodumodejenuk.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/526c76ed69c79175d4acacc4b36f5d0f/96330947125.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/fejufezafevuzedelipabul.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210612065802.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jikoxoxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chest+congestion+without+coughPDF 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_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 10420 bytes
SHA-256: e2d4b33b643c26b34b900ae4e5086751cbac67d58ccd890979fef084d3c2c998
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16820 bytes
SHA-256: 09847117fd8e9520fc8f1e23ccf41b250b15eb96ab9ea1a89a6ed136369a21a8
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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