Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7631c9ed6e1a232…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 04:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a4c911662732f1c18453b6e441b8355 SHA-1: aa01b7332510d6c2b95d28b1b477b23dbcea1c9f SHA-256: a7631c9ed6e1a23282fa7784ec85f73666c2e1b1066884b450bfa45b017c9a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://otczenacts.com/media/files/12858713184.pdf In PDF document text
    • http://alemotta.com/resources/original/file/92360695303.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e98d3aa09---wutonazuruvo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3f94hma253qm3e125uqtudbue2/59917190178.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b9d090d76---49599289111.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9ba2473f---1617666927.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/90ab0d556194521b2bf018c4ae42dfde/30470658317.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/78009730916.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bbde01c089757bd89d0cebeb41ba4ab2/xaponenuzizupinigete.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb00135299466fc3094ef3f6a0f1ee1f/85049577418.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/2ddf716eae74c8ca55200c12a2bfed58/xoxuf.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210727/210727210346381496xx5sdonpw5hd.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/tuvipaxulo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kik2ktphec9m0upt16vp8p75rg/40234760503.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b88b90f4e---fopigakupitifijubuvo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210828040618.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5965b989---99697649513.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc36649eb2---katuvuvunutogunorizod.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/76079112436.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/bixisonu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/dikenidamavinaloteze.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/nujoxojobediwasuv.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/10876359453.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/85500060718.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8cd4e46d---68863753506.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/71360094938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tyranid+codex+5th+edition+pdfPDF 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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 18640 bytes
SHA-256: 2da0a36e72009e967c3c92b218ad781f352df0ba51666a88ea8afca18a4bb92d
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 10816 bytes
SHA-256: 0bcdb97e7e32bc6327fbca917542538eabe5cecca7591f6c1ef36930842ef5c5
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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