Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf18e63f9bab893…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 22:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6a46c7c9b8a7c8eb54f18071194b3c9 SHA-1: 653487a797e4fc1a7d1283e68901b7d55a84b372 SHA-256: 5bf18e63f9bab8938f45bcaf2033fd15895669b4ed35c2404fa27ea8812742b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92318804c---62176661038.pdf In PDF document text
    • https://12waktu.com/contents//files/49193852343.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d84df3e6374---61837076067.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ecd517cb9ebddec70e624acb34370297/10108029657.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/32739203740.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/105569751260fba124b2685.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mapibaxijutizulakop.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62beea38ce---66617083216.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/12077992173.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p5noh49kg7lqdc4ttfb4uqg5fp/towibimabekuxul.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xosexurite.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/84531255279.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5eb2dcd2784d6cff6bb582e0020bc6a9/45255565901.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/1745251348.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/46d39f872556e113398715e26423a68c/68851353635.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/46484315725.pdfIn PDF document text
    • http://ducnhua.com/upload/files/serizesugu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7a48bb5f7f20e6c94e412ad0eaec57c7/bomesogonemotebonezezavij.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/sumulurunavud.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210731195930_p16nao.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584e6230df---55281050138.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9002c68e---liluruxufom.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kipugeturivalux.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/20213937726.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552f57a430---55142653314.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3742053ad---jobamazumixodikurevaxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=belajar+bahasa+inggris+pdf+filePDF 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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10880 bytes
SHA-256: a892222002f1f4f431705c5fdebba7afe900531e14bb28d34c6f099829d9cc08
font_01_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 16904 bytes
SHA-256: f2bc3421b320499e1fb15c924398abb060b3b2052a39ac35a299ad6ed6837685
font_02_sfnt_off000135af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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