Malicious PDF — malware analysis report

Static analysis result for SHA-256 0758940d876c8a26…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 01:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e029afce966d4ade27c9b3942f7ce06c SHA-1: a471ec16f8f9f00026fce6e24674b2436c8cd10c SHA-256: 0758940d876c8a266a5c9e34504f0f306033c0a913aa5c60ef69507e4f2548cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious link farm used to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11c646ddb---firilizufuka.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9ce0bec8---13494869942.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kodoxibaloladeti.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/72452492076.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/10d954b9eb50754c612cba2f458cd55f/banuvamujizusazazewinuv.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161272e16a5e98---majowuxede.pdfIn PDF document text
    • https://profesa.net/userFilesfile/47372739476.pdfIn PDF document text
    • https://parc-hotel.info/file/17529293616.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/35502840726.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/90985225963.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/10798233535.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/lezuga.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5b0cfb62---87346713125.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/mapemobukiwo.pdfIn PDF document text
    • http://xtra360.net/campannas/file/68455499684.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/soburebo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/38921234078.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/906b728982db0d1f17c8fdc3c2051374/sigabusogox.pdfIn PDF document text
    • http://ed-union05.ru/files/file/jukumemijipaladimiguza.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/85437783850.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/5548510776.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210606133639.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6a65f0903e3bd699d12bb6507051910b/dutite.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210815080158_28wybt.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lista+de+verbos+irregulares+en+ingles+y+espa%C3%B1ol+completa+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_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 18892 bytes
SHA-256: 88a199d25b038534afa74afe37f07770301039ee75de172e7bdf2eba255785d5
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 11544 bytes
SHA-256: 6aa61a9f9249de7621a94d724c68341829e157efad3d217bdeb00221c62ff451