Malicious PDF — malware analysis report

Static analysis result for SHA-256 447c019dcb66397b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 03:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5f91e113193774b91215a9a275327242 SHA-1: 94626b20f5417a7e330e7bea0ea89214a33f9fb3 SHA-256: 447c019dcb66397be7fc5709ee7fa0a72225aece34734a4701b845c33ae25714
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arablift.net/userfiles/file/munugakilodorulewodesetu.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/67103538703.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/wafopoxonogojefujebugebup.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nijugekubejowareli.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d92214a1f0---safupoxotofeluso.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/wugakomaketuwagema.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/babaxeruropivipuxad.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/kiwimejevakipebudazup.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/tovigefa.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/geloradevov.pdfIn PDF document text
    • http://abnicum.com/files/file/rekofelisalofafuj.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/fixirete.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/bidade.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/xakusowurim.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/79797690715.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/32953663118.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mijomuvevowitofitawi.pdfIn PDF document text
    • https://partnermind.cz/images/files/10149419298.pdfIn PDF document text
    • https://penzion-palice.cz/content/99042128206.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/55462839004.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5b12bf28---4528330572.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/kunegopetibupij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=night+mode+pro+apkPDF 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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 10588 bytes
SHA-256: e63f195b8127067409e265a392648f65b5ed6288d10d0c85a4124f27af8ad768
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 18172 bytes
SHA-256: b63046378ed15c873ea0f3be60a2e0db64807ca7fc750854769565e2bad507ec
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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