Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e6416677dcd46c…

MALICIOUS

PDF

95.5 KB Created: 2021-09-10 14:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4877cec77b62be48f2cbf31acf1ab5d SHA-1: 3fea6692dc360673261e00b9e7f0f09cd5072b06 SHA-256: 78e6416677dcd46ccfa1d1e1e597a61a4153610b43d6b658242c4774da212431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term=xlsx+document+reader' in one URL suggests a lure to download a malicious file disguised as a document reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 http://tnshoppingbag.com/upfiles/file/xepowiwimizufevamazodusi.pdf In PDF document text
    • https://nhahangbienhaitien.com/uploads/files/56193249592.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/xurilewepix.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061114504932.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/35100027435.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/42453471509.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/27498223660.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gudenabeme.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb4657b36---35629323042.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904230702.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/1915783691.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/fositodefa.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69341454932.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/bovijezidakovomi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/82013700299.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/xanotodokakikemomev.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/xawobebagivodenajizoji.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/90321224171.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jezadejexexefitudem.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff934de3---31950184156.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/95776498035.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210907022004.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9eb5b789---68075606363.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/e4foiu558sh3g65kc656uv4l57/jaxuko.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/malowo.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/suvezuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=xlsx+document+readerPDF 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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10648 bytes
SHA-256: 142231890a2ea0d7146ce0b3c060bc317ab1dc9373652273c9fc32f3e6dac6aa
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 20980 bytes
SHA-256: 870d8c3dc09a742c74fa195fb01b127eb60ea67ab67a646b119bc1193a315bff
font_03_sfnt_off0001533e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533E 18152 bytes
SHA-256: c2a8f7e9482904c998ff3692745802cf5e308a6d98838ab08774b903d27a43d9

Open this report in the interactive analyzer, or submit your own file for analysis.