Malicious PDF — malware analysis report

Static analysis result for SHA-256 4906824cc9aabb35…

MALICIOUS

PDF

211.7 KB Created: 2021-09-08 10:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be291bd35946b2f96961981ba86b2366 SHA-1: 1611bcdc0c9a4411e3f26c1a9e06fb0fffaf951c SHA-256: 4906824cc9aabb35b84e9aa3e27d9db914bfaf3e3698cae37394f4708b891b63
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the presence of numerous external URLs, some pointing to compromised CMS upload storage, suggests the document may attempt to download and execute further payloads or redirect users to malicious sites. The primary attack vector appears to be social engineering via a fake installation prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://abriganature.centralcms.cloud/galeria/files/31065217724.pdf In PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/69478432010.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/gugasaje.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rks8juqvk8s7mmh54b2rmgddgb/febibexeluwozeko.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kafidibatolurise.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/828ce34c553a0422bd9b867cc95b8ed2/kumizur.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/15978457284.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8ffdb8d87282deb6b7d3c62d3eeed27e/92455406169.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1abff409f6---gugukipinejibil.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/gikesekas.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/18q5aq0fqp1la7leun457a86h7/wajemerezami.pdfIn PDF document text
    • http://parfumland.sk/upl/nurireradexinovujokovefoz.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/gilesixakiwebaforutipiku.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/21423263874.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1c6345faea9723895e0ac5ddee321801/42651733780.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/81606973284.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2087eeee4c159358745a927467015594/dikusubojararegibotuxagip.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/kaxodawugewufos.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bd27e3157---72621253292.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210702031254.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d73bbeb59---19899524664.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1d9497f3cfd925cd0a03ffb14419c1cc/ridiluverivop.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/42881587237.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/11618680973.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ba976b46---74804123293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manually+remove+officescan+agent+xgPDF 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_off0002db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB92 11056 bytes
SHA-256: 18958264c6928699a5847886c18a4883a024799aba322e344ecb2546e1faf80a
font_01_sfnt_off0002f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F561 19448 bytes
SHA-256: b1d47c920a53e0a47e6aeddcf44c9f0354d3c105d9d551c97d1981b3ca64fa81
font_02_sfnt_off0003283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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