Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ce3ee1ef6b5700…

MALICIOUS

PDF

82.2 KB Created: 2021-08-24 18:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: efb500b07f7e92b5da7421ca9fb7e413 SHA-1: e188111da84a5047f4f90db8f29f17e0363afeed SHA-256: 26ce3ee1ef6b57009d256a26444ed6fa841f22589250b4942aaed06b2236795e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://language-coach.pl/uploads/files/66003234064.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609738fc3d828---kuvizofifamogu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/finuwupotedewumobexagike.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bn7045modobn0ulf9lb1vppalg/92059613111.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a487478d634eaa547f0894418a926d55/jowujujesizosuxateviv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be5a5e9e9---bikakiveramanezub.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/36250547734.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab02f2647b---17174627874.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a537c82b6---14612208542.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c9f6cfc1dea578f6c7c751a95f28e22/24853902863.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c512083d---30325940729.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fikagitif.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/41097911914.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/vubamuzefafavifani.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/sudelotuvesoremekogase.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc0e61fcb---jajugekuf.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/polemasidadogolevof.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/kerimudurani.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/c2b70dbb9eac1493c150c9d917f1645e.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/43538544575.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/novizipuravesekeginokidip.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3dec42f2b1a25178e76d6c06053b746a/5972425299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=feeling+of+thirst+after+drinking+waterPDF 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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 10788 bytes
SHA-256: c8ab518fe1b75c135fa01c36399e059b5e9d829a4821fb4a9839d739f0cbb315
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 17120 bytes
SHA-256: 5fba96c85146d244fd60834e1d4b4ef5a13908d51f41ea64989fa8235f4dcc5b
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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