Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cff617f0150c2e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 03:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93296846da50fb8d899ad55aa95815ca SHA-1: c0a08915f094841ccf6e6ac83f14ef3c8cb37ff9 SHA-256: 78cff617f0150c2eaba0300d19ad23cd648055ad33f6d85fdcc0900f2b2375ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://mumegram.com/userfiles/file/28759302347.pdf In PDF document text
    • http://goldmustang.ru/files/files/jukosa.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/31338750212.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fagisetaxubaloxofe.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/nelewamasetilom.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/dirotizawizexiwa.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/85267108269.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/63582461459.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/19115753794.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/rabuxavotawunoga.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/91000597842.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/morelixozukawasega.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dunolapodunasiwusosasip.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d6d5bcb1---tilitinekudakufojadoj.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/napumoda.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7fcc452894f8ee108286ecc2bd837194/zasumebin.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/37953516301.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3fe12c239---sinobagemisusipitipoj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5cadfc6e---poxoduwujunizurolodugirul.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/47060939677.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a2590d79---denutu.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/gujibalovapazimot.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/dojewolovitagetiwa.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/97325613324.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422fe5ada2---42274873733.pdfIn PDF document text
    • http://chicopharm.com/upload/files/gaxidetubokok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lg+quick+memo+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 20820 bytes
SHA-256: d7be3af7cc61e25b336a6439fe7e9f442473e88a2f20d75066e802c9e629ec1d
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10496 bytes
SHA-256: ab95d84126a5b6478ae375ffd19876d186300fbb71f7e51e0eb73ba25a06cdee
font_02_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 2004 bytes
SHA-256: 89cd01d6aaa529676cd8ce2c7b68a34e1a55fb5e8efdc7dc98a3bbd81b1f0407

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