Malicious PDF — malware analysis report

Static analysis result for SHA-256 36beb02a7a57418f…

MALICIOUS

PDF

81.1 KB Created: 2021-07-04 06:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 31c351ed18fb3eb9b793c18b51b835c5 SHA-1: ba6856a1263d4e72d371df384fb56a65add3bc94 SHA-256: 36beb02a7a57418fd3c044b23a7cc645beb23b032a2222d4edf8e1caebfe9351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites and serve other PDFs. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://sitpchemcieszyn.pl/_sitpchem/file/xuzisifixopixelanono.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d03a972dc47---wuzit.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f07c9736a---41425902465.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/1939934700.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a10557da2---kadizo.pdfIn PDF document text
    • http://devison-matras.com/upload/file/66754467110.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g1v9sldmo2q2ldtnr4aje2snah/43658692563.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/00c45f76b39292b7f7c122caa33bae93/gewejujigebanatomutirize.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/84973287921.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089388d53fca---80411523745.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/bd0399e3a485b7f7c7ba5ef5d2597016/dolesorapewex.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069a09bfee---17897294132.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607194475f12e---51891436091.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/xurajixulozupu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/793e585537e4a564011e5f623e766ac4/wasamezefifejidova.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/37375229576.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc539e2ce---4251661287.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a9ececff---bufor.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/37749420960.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b050a614c3a---betikeg.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/79688853520.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16239364054354.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/45730749431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+meaning+of+fubarPDF 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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 16996 bytes
SHA-256: 85dd74201326a068d2144c202fc658577f0a86f43c5d7ce8d4e9711b75e48bf7
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 10552 bytes
SHA-256: 02f3e35de2dfd0a8e7787b6fdea775a5e73d1963fe38223986524d92c6579f67
font_02_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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