Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef459d092dc53e02…

MALICIOUS

PDF

82.4 KB Created: 2021-10-06 13:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d86e5b97d16e7ff689a1239d6637120 SHA-1: 8fed1f1d1a0148f51e40a61da89f24026c681f06 SHA-256: ef459d092dc53e02297f456c71dd47d45461864f975cbffe8db0b3c9fb4f52e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=bsc+computer+notes PDF link annotation
    • https://atcotourismtravel.com/userfiles/file/13023838641.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/96765256102.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/48203142145.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/dinejetodemowaze.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910021540538641.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/sesujekijote.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/bolefugajodigozesu.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/24236241781.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f2i9s8sk1nfomjahdrh6vpvr97/22624859587.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/jewujumawisolupudiwuzoko.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b95f89d6f---49308208914.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/gijowofebuzuguferej.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210925131654.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/bubalorewirepevinesow.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/65984471617.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9e6526d6ba4e013d09164325f2bb4b98/64810147504.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4f46510e---xetaba.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bulazut.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/vurida.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/38485414423.pdfIn PDF document text
    • https://nevisnews.com/userfiles/20291120624.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/83640360715.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/lisafilu.pdfIn PDF document text
    • http://btcauction.vn/hinhanh/file/zogegamigasobupu.pdfIn PDF document text
    • https://limadelimon.com/images/file/vanabosekowixolune.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/95556321706.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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 18880 bytes
SHA-256: 0d72bb0418179460dddfa23c7b35b1ea52ce07d1f55cf77fd2088fc8266d9f26
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 10388 bytes
SHA-256: 52a4f9ab2759a0559bbe88499079d998a9c4cd2eba82c9b8b044825e4d62db57

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