Malicious PDF — malware analysis report

Static analysis result for SHA-256 78866add9a0e374d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 18:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6785a36d410086ac9aeb35609e06d2aa SHA-1: 759fb98dd4b78b0d0a0eca67dec06ed6b539fe61 SHA-256: 78866add9a0e374df6dcad24683516ecf8a27197e2b1841db94f9e03dc568fbd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern, likely aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=waptrick+prince+of+persia PDF link annotation
    • http://angerdress.store/ckfinder/userfiles/files/48006265575.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ab6fbc9b94400ab3d4ae02f6daee6473/delinoxun.pdfIn PDF document text
    • http://fxlcd.com/upload/file/48192008095.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/galamegulaga.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/23627049171.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67976832827.pdfIn PDF document text
    • http://wsm.hk/images/files/kikedima.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/3321887025.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/fipazozepaworofegev.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613544f9bed9f---rasimokamisefe.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0d09399ffa0b57349455842e16aee703/pemalosajebuso.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090719314635.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/gideni.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/48327122418.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/golilazinasolulabik.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/73015264932.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/69391971412.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jawomave.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92860037026.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/71902380288.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/26185485677.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/42303362801.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/mofilipelopumim.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/43554960774.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/22048892284.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_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 10512 bytes
SHA-256: 9dda8b2c68b8bef57df76950ae7cabded249f8ef4716a565f3687c539654f4c2
font_01_sfnt_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 17356 bytes
SHA-256: 4ebc0d964d1919b197d0cc49562d80fe84541a1981fa189ecb83e61d3b60454e
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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