Malicious PDF — malware analysis report

Static analysis result for SHA-256 341a012bd97e450c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 10:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c45284bf9ddde2d4453fff13c0a0b5f6 SHA-1: e97361c54e152482746cd3a214ef62ad627db49c SHA-256: 341a012bd97e450cdc196f2229e136e61c555e1e126f1fa6f39b616c581dbb68
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document's content and embedded URLs suggest a phishing attempt, likely to harvest sensitive recovery secret or private key information. The presence of multiple external URIs and link farms indicates an effort to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://catamma.ru/uplcv?utm_term=android+app+emulator+ios PDF link annotation
    • http://imhyuk.com/imhyukeditor/userfile/file/gegizumaralolaw.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/rofudidud.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210914003336_x75pco.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/rizenupezeki.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kimemanegapuziku.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fopozigonatodupusobos.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790867ad55---64096958287.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1vgki3hbev9avajl7j9rfogr6/86339782568.pdfIn PDF document text
    • http://runo34.ru/attachments/file/guwejoriwusujizukoza.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/dovodolaletefomajob.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614170522928e---nomareteruwozut.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba6ee8dc3---10721975595.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/23157203838.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9aa8cbe77---25843883017.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/33767331105.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/fubilon.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/50331831655.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/49jh4nfct4gbd3orrq7a92idht/65033446825.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92477310022.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/wuwixotipekavojokuzolige.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/41527004412.pdfIn PDF document text
    • http://lovesenergy.nl/file/zojegatejaf.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210908120403_239358918.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/28825734010.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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 18300 bytes
SHA-256: 0ec8470bc72fcf78fe2cfc1d1a95a7866704f0798132fe2fb348ebdeb4bc233a
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10636 bytes
SHA-256: 5028286438b7de6d5ccf463c8226ada58d562bff6a1a650e47b7576e97b6c648
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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