Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29c311efc16edbd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 09:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa17e8a2e0fb4274db337a82063cbc38 SHA-1: a2b78a78ff1c505e150f216ba8391b069ba2136e SHA-256: a29c311efc16edbdebb0eb646cf28da8784e8ab833aa9c4e58fcb63bbbaef111
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. Several heuristics indicate the PDF contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm structure strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8394

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ecf17a5d77e58543c3a536c148f6867d/40546731549.pdf In PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631531400.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/sunepogozesizika.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d263456ba2116e45b01d9197dabd643/kujavudezenazupokapojor.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fogozap.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e66cb6f0ab07422240cbf68fc00dd66f/dawamufowimodabon.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_FF13DF893D1BDCDC.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161494b03ef954---dazuxuzetotedezo.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zarogujidukaluxedovedapuv.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903135952.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a186d9de9---tasipupodekibabonowe.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/sodine.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/17806703707.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/xaxiw.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/5711143863.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcbdee8a0f---31418647819.pdfIn PDF document text
    • http://kaies.cn/upfiles/210917054159377814ax1cy9.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/saruderu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/nuzela.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/52316866963.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///85847322878.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/91489059429.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7b70b213---30610394144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bts+world+apk+unlimited+gemsPDF link annotation
    • 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_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 11064 bytes
SHA-256: 2fb6bec60ebe8c9d91085ebde9b298cd5248668bc08c5b0a977095b06c34f431
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 20860 bytes
SHA-256: 5de4c53b8e5777386ba08169729c50861118698ba09506d6d66abb9f6326a743
font_02_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_03_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1