Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5efbd4d51e92185…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 16:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 386a994212c22546c81d1ab0b5644533 SHA-1: ad0ce5df72f59299e86fab9aa3c53500d8d3546a SHA-256: b5efbd4d51e92185ff3d3c4186f3c8de025148a8110aee918dda832a90cbc922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many of which point to compromised websites hosting other PDF files. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jualumnitoronto.com/editor/uploadfiles/denesit.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd954eaaab4---mufalinapirotut.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/dubitadawe.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/kurotuxobitofes.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/96522124962.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/13687751991.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/73786122053.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kenutin.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/96991206888.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3597d2ffb---54290458672.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/digopumifuwiwurotudurat.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/78285016948.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/pibuwekexupokup.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5eafd8c1b---22211163764.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///wipisilegikokufugogojobel.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/bubofevotav.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a0300e67e6b0180b2c64a1ba7729e7db/54356121670.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o8lka23c5850j0hlrtj8fs2fei/98060322575.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rpt3sj4603cdr0s21cgo965sv7/zuvifefiwuris.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/63498726588.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/mufatubegoli.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/gegenaz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-4/20210704041716606142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=employee+appreciation+letter+format+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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 17404 bytes
SHA-256: c3e0681692dd5de7740c51a3fcfc1b4e5b76757f51fddd6196479b5084d1dc82
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 10708 bytes
SHA-256: 238f819a49cdf2a46891328383eda99347ac9b281387eb17dbc62ec6464954f9

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