Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38192562405ea0e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 12:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88dc6260a747730151769922d446f835 SHA-1: 80ce1231692267f0c16d8498550205c0b4c95711 SHA-256: d38192562405ea0ee098ed87490ebbe5294ebc2b88432911e74b9618358fbdc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and link farms, some hosted on compromised CMS uploads, indicates a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=gta+vice+city+romsmania PDF link annotation
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/sexuwixexosugatajaxefume.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lejazisiwuli.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e977b154b---84709451199.pdfIn PDF document text
    • http://immopolignano.lu/images/83678090521.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/68210066004.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f54b35b0---5240632195.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/vixakevefulef.pdfIn PDF document text
    • https://dacola.com/upload/files/vefinefanifeduwifuxap.pdfIn PDF document text
    • http://yuli-china.ru/d/files/86959142786.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/22985744362.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vetifonopurubejitanula.pdfIn PDF document text
    • https://medius.sk/userfiles/file/36521325017.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b120913c---44189486608.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/tenikug.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/25727972949.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3abcadf71b9255d4996384bf55d5c49f/43236864024.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aebbd88c8---95494779677.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cd89aa19032bde496995c622a58ad074/fojijibofejolidegafum.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/34736305089.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/11708629337.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/55rbioopi417r64la527rfifd0/pebenisojemutapug.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/94639968787.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_off0000bd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 16596 bytes
SHA-256: 0820882aef55bd2f6dfb21199d7bc503488ea61fba39995277f512e29fcb545d
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10564 bytes
SHA-256: 81176046a7b31f44c5566263604f74e54bf2da5e99dab92bbdca04f2e3dbcbb5
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1