Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a5526c949764ab…

MALICIOUS

PDF

82.1 KB Created: 2021-07-07 07:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f01c1adbac5920ef4b4482a87dc3107 SHA-1: a31735a0327e34054b09f4b926bbbe3f1135c672 SHA-256: f3a5526c949764ab049fe17df5fc5923ddb9d4eae068bfb470be746beabe319e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://archism.ru/uplcv?utm_term=spelling+workbook+answers PDF link annotation
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/de7b80d132be168a7f4ebc73f300ea34/makid.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/43738241738.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cd957d2d7c9---kesazusepavefikexi.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/dibupepolesugilojoxosi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9071530144---dudareboregidapipififev.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab743a93c---80579290928.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/peboje.pdfIn PDF document text
    • http://ahchala.com/img/file/fetinimafafutoworo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ebcf3d10---lifibitosisunoribopipobe.pdfIn PDF document text
    • http://blueyee.com/upload/file/160801594015.pdfIn PDF document text
    • https://fultoys.com/userfiles/lojez.pdfIn PDF document text
    • http://amdind.com/userfiles/file/bilotemukafunuliwavi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58da5255a---kigetikikekexoxew.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/seradesowixososumuvu.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/disabutuzajivaxogorobaret.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/50198928038.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/25599090763.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//38510697586.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9c7e07915147cfe871cc02f4f9779ad9/30671677457.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/30966837735.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b6de8d1d---42434530017.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870d1c79ac0---33852334793.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mitadigitizevuxoliwemujag.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/60051143418.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 10724 bytes
SHA-256: 04ab94fa777c2cba91a1cf61bdeafee2ce93dc2bf3c4d93ef0c1b1dae237458d
font_01_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 18536 bytes
SHA-256: eee0dd3ad57b357988f25c4a16f1d6a8f4662b65cd52e1aacdcc5e193b5b93c6
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742