Malicious PDF — malware analysis report

Static analysis result for SHA-256 5518170286703e44…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 06:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4097e0973268bce5bf3653f13187cac6 SHA-1: 30182946328d794c4e32d4515c4f500e66e4a8d8 SHA-256: 5518170286703e44abf5b64cf2bd4e6b6d16490a1fa0a9da1d63734a7876ebc6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The file's structure and numerous external links suggest an attempt to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thietbidienmanhcuong.com/upload/files/16339822372.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2oliv4atkl7ggqj383hfsqroe1/46649109942.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f7497be1835a90b9640ed0283cd75f95/buroguwikujakabebakikawez.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/danesoz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4153bc55.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/697fe993ce94ef085e0564bc607e7f1f/fodafitejazesugodonopef.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d017926461---jufes.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/85557515615.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16118e07c927b4---lafonifar.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/52464884052.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29c2930b5---tupagomope.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/12181cac509c88d33a74d278eed48b13/pobose.pdfIn PDF document text
    • http://vtaky.sk/media/file/14555640206.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/26089241561.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/61460825127.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/lutupovabixelisadisu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dbc151b604661eba7be1a570446db5b8/47973950220.pdfIn PDF document text
    • http://zgic.ru/!upload/files/59533217714.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/279c745c083483e9b186711930a72db2/53260037750.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/lajavapi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398bd38519---36849483252.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/35746223056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=akhand+bharat+book+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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 19036 bytes
SHA-256: e4acd9d63cb6d0c983e1017f5d180318a9faae25732a3b037fc988ccc850a149
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10372 bytes
SHA-256: 07c090235552e6e346412f294bfe55f2058fcc7148be6db2bd634143b7eec6b8
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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