Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f264370929c5c3…

MALICIOUS

PDF

73.3 KB Created: 2021-10-03 21:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 780841f0f3b0b7216c4c7b620edf29c1 SHA-1: 64375fdd40f2a524b51f10bd2c71084b6ed6f82e SHA-256: 38f264370929c5c34b7e46335c32bb4dc13a45c1fb61826510ac88f3a3df7577
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs, aiming to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615131e504b5e---zawepudopazemokapebetaxew.pdf In PDF document text
    • https://kawanmto.net/contents/files/89394931197.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/38251128ead6e1abdf24f1336ce73044/lenolinuxebotuxivef.pdfIn PDF document text
    • http://wych123.com/upload/files/guramugetiropixuber.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/pexezorisajirosatuwedeb.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/kebidi.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210924_115636.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/42997824822.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/41398064234.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16158f13064d66---xegelipovedibigenofutav.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/jupijazaxesasarimas.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/43848b6a4e7b62189ec34c975d6bec9b/nanupapovufurigefasabejo.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/biralixuf.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/1626965402.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/zimuxalanexokanekirutirex.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/lukosazoxexaxalobul.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/22838093374.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/rinasodetugirosile.pdfIn PDF document text
    • http://acelybio.com/upload/files/sesupi.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/26099909043.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/6369640045.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/seruxanilonotoxilozakabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tale+of+the+dragon+expansion+dlcPDF 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_off0000b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 10964 bytes
SHA-256: 90dc772fce65aa89ab9fd91a195f1b1c5eccfd419c261703de230b6f150ece4b
font_01_sfnt_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 19144 bytes
SHA-256: be5bd669da5828c415b1f4dc0b7d24d8cd2d49d420eb59346a8a041429d12efc
font_02_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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