Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aa988d6940415c…

MALICIOUS

PDF

98.9 KB Created: 2021-09-16 15:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49e91781a6ce64f7ef04ed79196a4bf8 SHA-1: db00d60a13641277e212f292c39d4bb6ac20303b SHA-256: 37aa988d6940415c3ce56269f6f2da43ac8f046a8452955b1d0697f10f148d52
204 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm pointing to compromised CMS uploads and potentially disposable hosting. The 'SE_CLICKFIX' heuristic suggests the document aims to trick the user into running a command, likely to download and execute a secondary payload. No scripts were extracted, but the embedded URLs are suspicious and likely lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://tnslib.tools/userfiles/files/46513116952.pdf In PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/lamasotilet.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/90740704974.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/garexaziwapumirirusizu.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ximojakawusi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388de898c31---2999910720.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/fozazatanuwe.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/zutubedimuwuwefutumiwi.pdfIn PDF document text
    • https://le27.fr/docs/file/71681605997.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/15932910980.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8f08cb7715ba976da5549266df9fc931/gumisedexatoxakawaxul.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/1692386184.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/keguwasukomezo.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/65714743755.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/77592439424.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/42504202982.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/59521058079.pdfIn PDF document text
    • https://adikmanis.com/contents/files/lumed.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210915_153829_3721.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f8a242ed---favufinumakobejux.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/bopubinozuwuxitunumurexi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0e78b89---sajevamumemalekavofob.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/gajafofo.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/vaputotawawexuzowetuzib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=configurar+mms+oi+androidPDF 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_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 20996 bytes
SHA-256: aed5c402aa0aa97c5182e33a50a5caa291a2f6b3f3137604b0dd1f4f40b9ec92
font_02_sfnt_off00016682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16682 10552 bytes
SHA-256: 3ee3a92804d43a85935bb1876481af7c2aed43797e4980f1f638631136450b9d

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