Malicious PDF — malware analysis report

Static analysis result for SHA-256 84184b39f9ec766e…

MALICIOUS

PDF

93.6 KB Created: 2021-07-09 20:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a474684c1c6ba320f8fd463f03864769 SHA-1: 3df552b78ef3dfc102b522d7350ab646f2778628 SHA-256: 84184b39f9ec766eeaeeb373042e21ef4a328673e8012e07afe5aaf587622a23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=high+school+musical+2+full+movie+streaming PDF link annotation
    • http://stpatricksreunion.com/clients/84553/File/4733526514.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/75753002817.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/59614678660.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e251f4c7a286c03fc97dd05e9012c881/gexusin.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4fb2e4c5e2568e4e1302c350f9a9513d/tabawitopumosowufetifev.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42134c5ccf---weposom.pdfIn PDF document text
    • https://carlojans.com/cms/file/sufisopesi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/85594262d120ec977d8952ed67dd43d6/8571301626.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160714d31eb99e---zutobosak.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/39262687764.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f951bbabb---jifelilerikoxitagow.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/vogunipukum.pdfIn PDF document text
    • https://airbays.com/userfiles/file/mewagoxepirivebutoduxo.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/59098973302.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/kudadoronipaxixigaveveked.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ccccc67d97eede87b1b15a18e63789f7/gixugejasuf.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ef6c257efa4ca57bb8d08374dd98b3ad/99446001594.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807569711c2---nixonasoseboja.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8af9d87d9---96065203398.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/63851507541.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3f23d7e57fb38c492562440727bf6df1/13737664316.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/40672771338.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8dab708953c9193983709ea392b83e7e/sibawesarasugur.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/gimiwagukalogoturul.pdfIn PDF document text
    • 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_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 11060 bytes
SHA-256: aa256868b400a6a74d107ac82f7392d6421850ad4b3a85bdf5460d9adcf3d8e0
font_01_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 17544 bytes
SHA-256: 66c94dede0bd376745f0bea20de886c9ed039c5b26eaba2664259dfba52c3d6d